diff --git a/python/vyos/system/raid.py b/python/vyos/system/raid.py
index 616d1adf7..5b33d34da 100644
--- a/python/vyos/system/raid.py
+++ b/python/vyos/system/raid.py
@@ -1,112 +1,122 @@
 # Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This library is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Lesser General Public
 # License as published by the Free Software Foundation; either
 # version 2.1 of the License, or (at your option) any later version.
 #
 # This library is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 # Lesser General Public License for more details.
 #
 # You should have received a copy of the GNU Lesser General Public License
 # along with this library.  If not, see <http://www.gnu.org/licenses/>.
 
 """RAID related functions"""
 
 from pathlib import Path
 from shutil import copy
 from dataclasses import dataclass
 
-from vyos.utils.process import cmd
+from vyos.utils.process import cmd, run
 from vyos.system import disk
 
 
 @dataclass
 class RaidDetails:
     """RAID type"""
     name: str
     level: str
     members: list[str]
     disks: list[disk.DiskDetails]
 
 
 def raid_create(raid_members: list[str],
                 raid_name: str = 'md0',
                 raid_level: str = 'raid1') -> None:
     """Create a RAID array
 
     Args:
         raid_name (str): a name of array (data, backup, test, etc.)
         raid_members (list[str]): a list of array members
         raid_level (str, optional): an array level. Defaults to 'raid1'.
     """
     raid_devices_num: int = len(raid_members)
     raid_members_str: str = ' '.join(raid_members)
-    if Path('/sys/firmware/efi').exists():
-        for part in raid_members:
-            drive: str = disk.partition_parent(part)
-            command: str = f'sgdisk --typecode=3:A19D880F-05FC-4D3B-A006-743F0F84911E {drive}'
-            cmd(command)
-    else:
-        for part in raid_members:
-            drive: str = disk.partition_parent(part)
-            command: str = f'sgdisk --typecode=3:A19D880F-05FC-4D3B-A006-743F0F84911E {drive}'
-            cmd(command)
+    for part in raid_members:
+        drive: str = disk.partition_parent(part)
+        # set partition type GUID for raid member; cf.
+        # https://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_type_GUIDs
+        command: str = f'sgdisk --typecode=3:A19D880F-05FC-4D3B-A006-743F0F84911E {drive}'
+        cmd(command)
     command: str = f'mdadm --create /dev/{raid_name} -R --metadata=1.0 \
         --raid-devices={raid_devices_num} --level={raid_level} \
         {raid_members_str}'
 
     cmd(command)
 
     raid = RaidDetails(
         name = f'/dev/{raid_name}',
         level = raid_level,
         members = raid_members,
         disks = [disk.from_partition(m) for m in raid_members]
     )
 
     return raid
 
+def clear():
+    """Deactivate all RAID arrays"""
+    command: str = 'mdadm --examine --scan'
+    raid_config = cmd(command)
+    if not raid_config:
+        return
+    command: str = 'mdadm --run /dev/md?*'
+    run(command)
+    command: str = 'mdadm --assemble --scan --auto=yes --symlink=no'
+    run(command)
+    command: str = 'mdadm --stop --scan'
+    run(command)
+
+
 def update_initramfs() -> None:
     """Update initramfs"""
     mdadm_script = '/etc/initramfs-tools/scripts/local-top/mdadm'
     copy('/usr/share/initramfs-tools/scripts/local-block/mdadm', mdadm_script)
     p = Path(mdadm_script)
     p.write_text(p.read_text().replace('$((COUNT + 1))', '20'))
     command: str = 'update-initramfs -u'
     cmd(command)
 
 def update_default(target_dir: str) -> None:
     """Update /etc/default/mdadm to start MD monitoring daemon at boot
     """
     source_mdadm_config = '/etc/default/mdadm'
     target_mdadm_config = Path(target_dir).joinpath('/etc/default/mdadm')
     target_mdadm_config_dir = Path(target_mdadm_config).parent
     Path.mkdir(target_mdadm_config_dir, parents=True, exist_ok=True)
     s = Path(source_mdadm_config).read_text().replace('START_DAEMON=false',
                                                       'START_DAEMON=true')
     Path(target_mdadm_config).write_text(s)
 
 def get_uuid(device: str) -> str:
     """Get UUID of a device"""
     command: str = f'tune2fs -l {device}'
     l = cmd(command).splitlines()
     uuid = next((x for x in l if x.startswith('Filesystem UUID')), '')
     return uuid.split(':')[1].strip() if uuid else ''
 
 def get_uuids(raid_details: RaidDetails) -> tuple[str]:
     """Get UUIDs of RAID members
 
     Args:
         raid_name (str): a name of array (data, backup, test, etc.)
 
     Returns:
         tuple[str]: root_disk uuid, root_md uuid
     """
     raid_name: str = raid_details.name
     root_partition: str = raid_details.members[0]
     uuid_root_disk: str = get_uuid(root_partition)
     uuid_root_md: str = get_uuid(raid_name)
     return uuid_root_disk, uuid_root_md
diff --git a/src/op_mode/image_installer.py b/src/op_mode/image_installer.py
index 9452c5e28..66ce8f2e6 100755
--- a/src/op_mode/image_installer.py
+++ b/src/op_mode/image_installer.py
@@ -1,875 +1,876 @@
 #!/usr/bin/env python3
 #
 # Copyright 2023 VyOS maintainers and contributors <maintainers@vyos.io>
 #
 # This file is part of VyOS.
 #
 # VyOS is free software: you can redistribute it and/or modify it under the
 # terms of the GNU General Public License as published by the Free Software
 # Foundation, either version 3 of the License, or (at your option) any later
 # version.
 #
 # VyOS is distributed in the hope that it will be useful, but WITHOUT ANY
 # WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 # FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 # details.
 #
 # You should have received a copy of the GNU General Public License along with
 # VyOS. If not, see <https://www.gnu.org/licenses/>.
 
 from argparse import ArgumentParser, Namespace
 from pathlib import Path
 from shutil import copy, chown, rmtree, copytree
 from glob import glob
 from sys import exit
 from time import sleep
 from typing import Union
 from urllib.parse import urlparse
 from passlib.hosts import linux_context
 
 from psutil import disk_partitions
 
 from vyos.configtree import ConfigTree
 from vyos.remote import download
 from vyos.system import disk, grub, image, compat, raid, SYSTEM_CFG_VER
 from vyos.template import render
 from vyos.utils.io import ask_input, ask_yes_no, select_entry
 from vyos.utils.file import chmod_2775
 from vyos.utils.process import cmd, run
 
 # define text messages
 MSG_ERR_NOT_LIVE: str = 'The system is already installed. Please use "add system image" instead.'
 MSG_ERR_LIVE: str = 'The system is in live-boot mode. Please use "install image" instead.'
 MSG_ERR_NO_DISK: str = 'No suitable disk was found. There must be at least one disk of 2GB or greater size.'
 MSG_ERR_IMPROPER_IMAGE: str = 'Missing sha256sum.txt.\nEither this image is corrupted, or of era 1.2.x (md5sum) and would downgrade image tools;\ndisallowed in either case.'
 MSG_INFO_INSTALL_WELCOME: str = 'Welcome to VyOS installation!\nThis command will install VyOS to your permanent storage.'
 MSG_INFO_INSTALL_EXIT: str = 'Exiting from VyOS installation'
 MSG_INFO_INSTALL_SUCCESS: str = 'The image installed successfully; please reboot now.'
 MSG_INFO_INSTALL_DISKS_LIST: str = 'The following disks were found:'
 MSG_INFO_INSTALL_DISK_SELECT: str = 'Which one should be used for installation?'
 MSG_INFO_INSTALL_RAID_CONFIGURE: str = 'Would you like to configure RAID-1 mirroring?'
 MSG_INFO_INSTALL_RAID_FOUND_DISKS: str = 'Would you like to configure RAID-1 mirroring on them?'
 MSG_INFO_INSTALL_RAID_CHOOSE_DISKS: str = 'Would you like to choose two disks for RAID-1 mirroring?'
 MSG_INFO_INSTALL_DISK_CONFIRM: str = 'Installation will delete all data on the drive. Continue?'
 MSG_INFO_INSTALL_RAID_CONFIRM: str = 'Installation will delete all data on both drives. Continue?'
 MSG_INFO_INSTALL_PARTITONING: str = 'Creating partition table...'
 MSG_INPUT_CONFIG_FOUND: str = 'An active configuration was found. Would you like to copy it to the new image?'
 MSG_INPUT_IMAGE_NAME: str = 'What would you like to name this image?'
 MSG_INPUT_IMAGE_DEFAULT: str = 'Would you like to set the new image as the default one for boot?'
 MSG_INPUT_PASSWORD: str = 'Please enter a password for the "vyos" user'
 MSG_INPUT_ROOT_SIZE_ALL: str = 'Would you like to use all the free space on the drive?'
 MSG_INPUT_ROOT_SIZE_SET: str = 'Please specify the size (in GB) of the root partition (min is 1.5 GB)?'
 MSG_INPUT_CONSOLE_TYPE: str = 'What console should be used by default? (K: KVM, S: Serial, U: USB-Serial)?'
 MSG_INPUT_COPY_DATA: str = 'Would you like to copy data to the new image?'
 MSG_INPUT_CHOOSE_COPY_DATA: str = 'From which image would you like to save config information?'
 MSG_WARN_ISO_SIGN_INVALID: str = 'Signature is not valid. Do you want to continue with installation?'
 MSG_WARN_ISO_SIGN_UNAVAL: str = 'Signature is not available. Do you want to continue with installation?'
 MSG_WARN_ROOT_SIZE_TOOBIG: str = 'The size is too big. Try again.'
 MSG_WARN_ROOT_SIZE_TOOSMALL: str = 'The size is too small. Try again'
 MSG_WARN_IMAGE_NAME_WRONG: str = 'The suggested name is unsupported!\n'
 'It must be between 1 and 32 characters long and contains only the next characters: .+-_ a-z A-Z 0-9'
 CONST_MIN_DISK_SIZE: int = 2147483648  # 2 GB
 CONST_MIN_ROOT_SIZE: int = 1610612736  # 1.5 GB
 # a reserved space: 2MB for header, 1 MB for BIOS partition, 256 MB for EFI
 CONST_RESERVED_SPACE: int = (2 + 1 + 256) * 1024**2
 
 # define directories and paths
 DIR_INSTALLATION: str = '/mnt/installation'
 DIR_ROOTFS_SRC: str = f'{DIR_INSTALLATION}/root_src'
 DIR_ROOTFS_DST: str = f'{DIR_INSTALLATION}/root_dst'
 DIR_ISO_MOUNT: str = f'{DIR_INSTALLATION}/iso_src'
 DIR_DST_ROOT: str = f'{DIR_INSTALLATION}/disk_dst'
 DIR_KERNEL_SRC: str = '/boot/'
 FILE_ROOTFS_SRC: str = '/usr/lib/live/mount/medium/live/filesystem.squashfs'
 ISO_DOWNLOAD_PATH: str = '/tmp/vyos_installation.iso'
 
 # default boot variables
 DEFAULT_BOOT_VARS: dict[str, str] = {
     'timeout': '5',
     'console_type': 'tty',
     'console_num': '0',
     'bootmode': 'normal'
 }
 
 
 def bytes_to_gb(size: int) -> float:
     """Convert Bytes to GBytes, rounded to 1 decimal number
 
     Args:
         size (int): input size in bytes
 
     Returns:
         float: size in GB
     """
     return round(size / 1024**3, 1)
 
 
 def gb_to_bytes(size: float) -> int:
     """Convert GBytes to Bytes
 
     Args:
         size (float): input size in GBytes
 
     Returns:
         int: size in bytes
     """
     return int(size * 1024**3)
 
 
 def find_disks() -> dict[str, int]:
     """Find a target disk for installation
 
     Returns:
         dict[str, int]: a list of available disks by name and size
     """
     # check for available disks
     print('Probing disks')
     disks_available: dict[str, int] = disk.disks_size()
     for disk_name, disk_size in disks_available.copy().items():
         if disk_size < CONST_MIN_DISK_SIZE:
             del disks_available[disk_name]
     if not disks_available:
         print(MSG_ERR_NO_DISK)
         exit(MSG_INFO_INSTALL_EXIT)
 
     num_disks: int = len(disks_available)
     print(f'{num_disks} disk(s) found')
 
     return disks_available
 
 
 def ask_root_size(available_space: int) -> int:
     """Define a size of root partition
 
     Args:
         available_space (int): available space in bytes for a root partition
 
     Returns:
         int: defined size
     """
     if ask_yes_no(MSG_INPUT_ROOT_SIZE_ALL, default=True):
         return available_space
 
     while True:
         root_size_gb: str = ask_input(MSG_INPUT_ROOT_SIZE_SET)
         root_size_kbytes: int = (gb_to_bytes(float(root_size_gb))) // 1024
 
         if root_size_kbytes > available_space:
             print(MSG_WARN_ROOT_SIZE_TOOBIG)
             continue
         if root_size_kbytes < CONST_MIN_ROOT_SIZE / 1024:
             print(MSG_WARN_ROOT_SIZE_TOOSMALL)
             continue
 
         return root_size_kbytes
 
 def create_partitions(target_disk: str, target_size: int,
                       prompt: bool = True) -> None:
     """Create partitions on a target disk
 
     Args:
         target_disk (str): a target disk
         target_size (int): size of disk in bytes
     """
     # define target rootfs size in KB (smallest unit acceptable by sgdisk)
     available_size: int = (target_size - CONST_RESERVED_SPACE) // 1024
     if prompt:
         rootfs_size: int = ask_root_size(available_size)
     else:
         rootfs_size: int = available_size
 
     print(MSG_INFO_INSTALL_PARTITONING)
+    raid.clear()
     disk.disk_cleanup(target_disk)
     disk_details: disk.DiskDetails = disk.parttable_create(target_disk,
                                                            rootfs_size)
 
     return disk_details
 
 
 def search_format_selection(image: tuple[str, str]) -> str:
     """Format a string for selection of image
 
     Args:
         image (tuple[str, str]): a tuple of image name and drive
 
     Returns:
         str: formatted string
     """
     return f'{image[0]} on {image[1]}'
 
 
 def search_previous_installation(disks: list[str]) -> None:
     """Search disks for previous installation config and SSH keys
 
     Args:
         disks (list[str]): a list of available disks
     """
     mnt_config = '/mnt/config'
     mnt_ssh = '/mnt/ssh'
     mnt_tmp = '/mnt/tmp'
     rmtree(Path(mnt_config), ignore_errors=True)
     rmtree(Path(mnt_ssh), ignore_errors=True)
     Path(mnt_tmp).mkdir(exist_ok=True)
 
     print('Searching for data from previous installations')
     image_data = []
     for disk_name in disks:
         for partition in disk.partition_list(disk_name):
             if disk.partition_mount(partition, mnt_tmp):
                 if Path(mnt_tmp + '/boot').exists():
                     for path in Path(mnt_tmp + '/boot').iterdir():
                         if path.joinpath('rw/config/.vyatta_config').exists():
                             image_data.append((path.name, partition))
 
                 disk.partition_umount(partition)
 
     if len(image_data) == 1:
         image_name, image_drive = image_data[0]
         print('Found data from previous installation:')
         print(f'\t{image_name} on {image_drive}')
         if not ask_yes_no(MSG_INPUT_COPY_DATA, default=True):
             return
 
     elif len(image_data) > 1:
         print('Found data from previous installations')
         if not ask_yes_no(MSG_INPUT_COPY_DATA, default=True):
             return
 
         image_name, image_drive = select_entry(image_data,
                                                'Available versions:',
                                                MSG_INPUT_CHOOSE_COPY_DATA,
                                                search_format_selection)
     else:
         print('No previous installation found')
         return
 
     disk.partition_mount(image_drive, mnt_tmp)
 
     copytree(f'{mnt_tmp}/boot/{image_name}/rw/config', mnt_config)
     Path(mnt_ssh).mkdir()
     host_keys: list[str] = glob(f'{mnt_tmp}/boot/{image_name}/rw/etc/ssh/ssh_host*')
     for host_key in host_keys:
         copy(host_key, mnt_ssh)
 
     disk.partition_umount(image_drive)
 
 
 def copy_previous_installation_data(target_dir: str) -> None:
     if Path('/mnt/config').exists():
         copytree('/mnt/config', f'{target_dir}/opt/vyatta/etc/config',
                  dirs_exist_ok=True)
     if Path('/mnt/ssh').exists():
         copytree('/mnt/ssh', f'{target_dir}/etc/ssh',
                  dirs_exist_ok=True)
 
 
 def ask_single_disk(disks_available: dict[str, int]) -> str:
     """Ask user to select a disk for installation
 
     Args:
         disks_available (dict[str, int]): a list of available disks
     """
     print(MSG_INFO_INSTALL_DISKS_LIST)
     default_disk: str = list(disks_available)[0]
     for disk_name, disk_size in disks_available.items():
         disk_size_human: str = bytes_to_gb(disk_size)
         print(f'Drive: {disk_name} ({disk_size_human} GB)')
     disk_selected: str = ask_input(MSG_INFO_INSTALL_DISK_SELECT,
                                    default=default_disk,
                                    valid_responses=list(disks_available))
 
     # create partitions
     if not ask_yes_no(MSG_INFO_INSTALL_DISK_CONFIRM):
         print(MSG_INFO_INSTALL_EXIT)
         exit()
 
     search_previous_installation(list(disks_available))
 
     disk_details: disk.DiskDetails = create_partitions(disk_selected,
                                                        disks_available[disk_selected])
 
     disk.filesystem_create(disk_details.partition['efi'], 'efi')
     disk.filesystem_create(disk_details.partition['root'], 'ext4')
 
     return disk_details
 
 
 def check_raid_install(disks_available: dict[str, int]) -> Union[str, None]:
     """Ask user to select disks for RAID installation
 
     Args:
         disks_available (dict[str, int]): a list of available disks
     """
     if len(disks_available) < 2:
         return None
 
     if not ask_yes_no(MSG_INFO_INSTALL_RAID_CONFIGURE, default=True):
         return None
 
     def format_selection(disk_name: str) -> str:
         return f'{disk_name}\t({bytes_to_gb(disks_available[disk_name])} GB)'
 
     disk0, disk1 = list(disks_available)[0], list(disks_available)[1]
     disks_selected: dict[str, int] = { disk0: disks_available[disk0],
                                        disk1: disks_available[disk1] }
 
     target_size: int = min(disks_selected[disk0], disks_selected[disk1])
 
     print(MSG_INFO_INSTALL_DISKS_LIST)
     for disk_name, disk_size in disks_selected.items():
         disk_size_human: str = bytes_to_gb(disk_size)
         print(f'\t{disk_name} ({disk_size_human} GB)')
     if not ask_yes_no(MSG_INFO_INSTALL_RAID_FOUND_DISKS, default=True):
         if not ask_yes_no(MSG_INFO_INSTALL_RAID_CHOOSE_DISKS, default=True):
             return None
         else:
             disks_selected = {}
             disk0 = select_entry(list(disks_available), 'Disks available:',
                                  'Select first disk:', format_selection)
 
             disks_selected[disk0] = disks_available[disk0]
             del disks_available[disk0]
             disk1 = select_entry(list(disks_available), 'Remaining disks:',
                                  'Select second disk:', format_selection)
             disks_selected[disk1] = disks_available[disk1]
 
             target_size: int = min(disks_selected[disk0],
                                    disks_selected[disk1])
 
     # create partitions
     if not ask_yes_no(MSG_INFO_INSTALL_RAID_CONFIRM):
         print(MSG_INFO_INSTALL_EXIT)
         exit()
 
     search_previous_installation(list(disks_available))
 
     disks: list[disk.DiskDetails] = []
     for disk_selected in list(disks_selected):
         print(f'Creating partitions on {disk_selected}')
         disk_details = create_partitions(disk_selected, target_size,
                                          prompt=False)
         disk.filesystem_create(disk_details.partition['efi'], 'efi')
 
         disks.append(disk_details)
 
     print('Creating RAID array')
     members = [disk.partition['root'] for disk in disks]
     raid_details: raid.RaidDetails = raid.raid_create(members)
     # raid init stuff
     print('Updating initramfs')
     raid.update_initramfs()
     # end init
     print('Creating filesystem on RAID array')
     disk.filesystem_create(raid_details.name, 'ext4')
 
     return raid_details
 
 
 def prepare_tmp_disr() -> None:
     """Create temporary directories for installation
     """
     print('Creating temporary directories')
     for dir in [DIR_ROOTFS_SRC, DIR_ROOTFS_DST, DIR_DST_ROOT]:
         dirpath = Path(dir)
         dirpath.mkdir(mode=0o755, parents=True)
 
 
 def setup_grub(root_dir: str) -> None:
     """Install GRUB configurations
 
     Args:
         root_dir (str): a path to the root of target filesystem
     """
     print('Installing GRUB configuration files')
     grub_cfg_main = f'{root_dir}/{grub.GRUB_DIR_MAIN}/grub.cfg'
     grub_cfg_vars = f'{root_dir}/{grub.CFG_VYOS_VARS}'
     grub_cfg_modules = f'{root_dir}/{grub.CFG_VYOS_MODULES}'
     grub_cfg_menu = f'{root_dir}/{grub.CFG_VYOS_MENU}'
     grub_cfg_options = f'{root_dir}/{grub.CFG_VYOS_OPTIONS}'
 
     # create new files
     render(grub_cfg_main, grub.TMPL_GRUB_MAIN, {})
     grub.common_write(root_dir)
     grub.vars_write(grub_cfg_vars, DEFAULT_BOOT_VARS)
     grub.modules_write(grub_cfg_modules, [])
     grub.write_cfg_ver(1, root_dir)
     render(grub_cfg_menu, grub.TMPL_GRUB_MENU, {})
     render(grub_cfg_options, grub.TMPL_GRUB_OPTS, {})
 
 
 def configure_authentication(config_file: str, password: str) -> None:
     """Write encrypted password to config file
 
     Args:
         config_file (str): path of target config file
         password (str): plaintext password
 
     N.B. this can not be deferred by simply setting the plaintext password
     and relying on the config mode script to process at boot, as the config
     will not automatically be saved in that case, thus leaving the
     plaintext exposed
     """
     encrypted_password = linux_context.hash(password)
 
     with open(config_file) as f:
         config_string = f.read()
 
     config = ConfigTree(config_string)
     config.set([
         'system', 'login', 'user', 'vyos', 'authentication',
         'encrypted-password'
     ],
                value=encrypted_password,
                replace=True)
     config.set_tag(['system', 'login', 'user'])
 
     with open(config_file, 'w') as f:
         f.write(config.to_string())
 
 def validate_signature(file_path: str, sign_type: str) -> None:
     """Validate a file by signature and delete a signature file
 
     Args:
         file_path (str): a path to file
         sign_type (str): a signature type
     """
     print('Validating signature')
     signature_valid: bool = False
     # validate with minisig
     if sign_type == 'minisig':
         for pubkey in [
                 '/usr/share/vyos/keys/vyos-release.minisign.pub',
                 '/usr/share/vyos/keys/vyos-backup.minisign.pub'
         ]:
             if run(f'minisign -V -q -p {pubkey} -m {file_path} -x {file_path}.minisig'
                   ) == 0:
                 signature_valid = True
                 break
         Path(f'{file_path}.minisig').unlink()
     # validate with GPG
     if sign_type == 'asc':
         if run(f'gpg --verify ${file_path}.asc ${file_path}') == 0:
             signature_valid = True
         Path(f'{file_path}.asc').unlink()
 
     # warn or pass
     if not signature_valid:
         if not ask_yes_no(MSG_WARN_ISO_SIGN_INVALID, default=False):
             exit(MSG_INFO_INSTALL_EXIT)
     else:
         print('Signature is valid')
 
 
 def image_fetch(image_path: str, no_prompt: bool = False) -> Path:
     """Fetch an ISO image
 
     Args:
         image_path (str): a path, remote or local
 
     Returns:
         Path: a path to a local file
     """
     try:
         # check a type of path
         if urlparse(image_path).scheme:
             # download an image
             download(ISO_DOWNLOAD_PATH, image_path, True, True,
                      raise_error=True)
             # download a signature
             sign_file = (False, '')
             for sign_type in ['minisig', 'asc']:
                 try:
                     download(f'{ISO_DOWNLOAD_PATH}.{sign_type}',
                              f'{image_path}.{sign_type}', raise_error=True)
                     sign_file = (True, sign_type)
                     break
                 except Exception:
                     print(f'{sign_type} signature is not available')
             # validate a signature if it is available
             if sign_file[0]:
                 validate_signature(ISO_DOWNLOAD_PATH, sign_file[1])
             else:
                 if (not no_prompt and
                     not ask_yes_no(MSG_WARN_ISO_SIGN_UNAVAL, default=False)):
                     cleanup()
                     exit(MSG_INFO_INSTALL_EXIT)
 
             return Path(ISO_DOWNLOAD_PATH)
         else:
             local_path: Path = Path(image_path)
             if local_path.is_file():
                 return local_path
             else:
                 raise FileNotFoundError
     except Exception:
         print(f'The image cannot be fetched from: {image_path}')
         exit(1)
 
 
 def migrate_config() -> bool:
     """Check for active config and ask user for migration
 
     Returns:
         bool: user's decision
     """
     active_config_path: Path = Path('/opt/vyatta/etc/config/config.boot')
     if active_config_path.exists():
         if ask_yes_no(MSG_INPUT_CONFIG_FOUND, default=True):
             return True
     return False
 
 
 def copy_ssh_host_keys() -> bool:
     """Ask user to copy SSH host keys
 
     Returns:
         bool: user's decision
     """
     if ask_yes_no('Would you like to copy SSH host keys?', default=True):
         return True
     return False
 
 
 def cleanup(mounts: list[str] = [], remove_items: list[str] = []) -> None:
     """Clean up after installation
 
     Args:
         mounts (list[str], optional): List of mounts to unmount.
         Defaults to [].
         remove_items (list[str], optional): List of files or directories
         to remove. Defaults to [].
     """
     print('Cleaning up')
     # clean up installation directory by default
     mounts_all = disk_partitions(all=True)
     for mounted_device in mounts_all:
         if mounted_device.mountpoint.startswith(DIR_INSTALLATION) and not (
                 mounted_device.device in mounts or
                 mounted_device.mountpoint in mounts):
             mounts.append(mounted_device.mountpoint)
     # add installation dir to cleanup list
     if DIR_INSTALLATION not in remove_items:
         remove_items.append(DIR_INSTALLATION)
     # also delete an ISO file
     if Path(ISO_DOWNLOAD_PATH).exists(
     ) and ISO_DOWNLOAD_PATH not in remove_items:
         remove_items.append(ISO_DOWNLOAD_PATH)
 
     if mounts:
         print('Unmounting target filesystems')
         for mountpoint in mounts:
             disk.partition_umount(mountpoint)
     if remove_items:
         print('Removing temporary files')
         for remove_item in remove_items:
             if Path(remove_item).exists():
                 if Path(remove_item).is_file():
                     Path(remove_item).unlink()
                 if Path(remove_item).is_dir():
                     rmtree(remove_item)
 
 def cleanup_raid(details: raid.RaidDetails) -> None:
     efiparts = []
     for raid_disk in details.disks:
         efiparts.append(raid_disk.partition['efi'])
     cleanup([details.name, *efiparts],
             ['/mnt/installation'])
 
 
 def is_raid_install(install_object: Union[disk.DiskDetails, raid.RaidDetails]) -> bool:
     """Check if installation target is a RAID array
 
     Args:
         install_object (Union[disk.DiskDetails, raid.RaidDetails]): a target disk
 
     Returns:
         bool: True if it is a RAID array
     """
     if isinstance(install_object, raid.RaidDetails):
         return True
     return False
 
 
 def install_image() -> None:
     """Install an image to a disk
     """
     if not image.is_live_boot():
         exit(MSG_ERR_NOT_LIVE)
 
     print(MSG_INFO_INSTALL_WELCOME)
     if not ask_yes_no('Would you like to continue?'):
         print(MSG_INFO_INSTALL_EXIT)
         exit()
 
     # configure image name
     running_image_name: str = image.get_running_image()
     while True:
         image_name: str = ask_input(MSG_INPUT_IMAGE_NAME,
                                     running_image_name)
         if image.validate_name(image_name):
             break
         print(MSG_WARN_IMAGE_NAME_WRONG)
 
     # ask for password
     user_password: str = ask_input(MSG_INPUT_PASSWORD, default='vyos',
                                    no_echo=True)
 
     # ask for default console
     console_type: str = ask_input(MSG_INPUT_CONSOLE_TYPE,
                                   default='K',
                                   valid_responses=['K', 'S', 'U'])
     console_dict: dict[str, str] = {'K': 'tty', 'S': 'ttyS', 'U': 'ttyUSB'}
 
     disks: dict[str, int] = find_disks()
 
     install_target: Union[disk.DiskDetails, raid.RaidDetails, None] = None
     try:
         install_target = check_raid_install(disks)
         if install_target is None:
             install_target = ask_single_disk(disks)
 
         # create directories for installation media
         prepare_tmp_disr()
 
         # mount target filesystem and create required dirs inside
         print('Mounting new partitions')
         if is_raid_install(install_target):
             disk.partition_mount(install_target.name, DIR_DST_ROOT)
             Path(f'{DIR_DST_ROOT}/boot/efi').mkdir(parents=True)
         else:
             disk.partition_mount(install_target.partition['root'], DIR_DST_ROOT)
             Path(f'{DIR_DST_ROOT}/boot/efi').mkdir(parents=True)
             disk.partition_mount(install_target.partition['efi'], f'{DIR_DST_ROOT}/boot/efi')
 
         # a config dir. It is the deepest one, so the comand will
         # create all the rest in a single step
         print('Creating a configuration file')
         target_config_dir: str = f'{DIR_DST_ROOT}/boot/{image_name}/rw/opt/vyatta/etc/config/'
         Path(target_config_dir).mkdir(parents=True)
         chown(target_config_dir, group='vyattacfg')
         chmod_2775(target_config_dir)
         # copy config
         copy('/opt/vyatta/etc/config/config.boot', target_config_dir)
         configure_authentication(f'{target_config_dir}/config.boot',
                                  user_password)
         Path(f'{target_config_dir}/.vyatta_config').touch()
 
         # create a persistence.conf
         Path(f'{DIR_DST_ROOT}/persistence.conf').write_text('/ union\n')
 
         # copy system image and kernel files
         print('Copying system image files')
         for file in Path(DIR_KERNEL_SRC).iterdir():
             if file.is_file():
                 copy(file, f'{DIR_DST_ROOT}/boot/{image_name}/')
         copy(FILE_ROOTFS_SRC,
              f'{DIR_DST_ROOT}/boot/{image_name}/{image_name}.squashfs')
 
         # copy saved config data and SSH keys
         # owner restored on copy of config data by chmod_2775, above
         copy_previous_installation_data(f'{DIR_DST_ROOT}/boot/{image_name}/rw')
 
         if is_raid_install(install_target):
             write_dir: str = f'{DIR_DST_ROOT}/boot/{image_name}/rw'
             raid.update_default(write_dir)
 
         setup_grub(DIR_DST_ROOT)
         # add information about version
         grub.create_structure()
         grub.version_add(image_name, DIR_DST_ROOT)
         grub.set_default(image_name, DIR_DST_ROOT)
         grub.set_console_type(console_dict[console_type], DIR_DST_ROOT)
 
         if is_raid_install(install_target):
             # add RAID specific modules
             grub.modules_write(f'{DIR_DST_ROOT}/{grub.CFG_VYOS_MODULES}',
                                ['part_msdos', 'part_gpt', 'diskfilter',
                                 'ext2','mdraid1x'])
         # install GRUB
         if is_raid_install(install_target):
             print('Installing GRUB to the drives')
             l = install_target.disks
             for disk_target in l:
                 disk.partition_mount(disk_target.partition['efi'], f'{DIR_DST_ROOT}/boot/efi')
                 grub.install(disk_target.name, f'{DIR_DST_ROOT}/boot/',
                              f'{DIR_DST_ROOT}/boot/efi',
                              id=f'VyOS (RAID disk {l.index(disk_target) + 1})')
                 disk.partition_umount(disk_target.partition['efi'])
         else:
             print('Installing GRUB to the drive')
             grub.install(install_target.name, f'{DIR_DST_ROOT}/boot/',
                          f'{DIR_DST_ROOT}/boot/efi')
 
         # umount filesystems and remove temporary files
         if is_raid_install(install_target):
             cleanup([install_target.name],
                     ['/mnt/installation'])
         else:
             cleanup([install_target.partition['efi'],
                      install_target.partition['root']],
                     ['/mnt/installation'])
 
         # we are done
         print(MSG_INFO_INSTALL_SUCCESS)
         exit()
 
     except Exception as err:
         print(f'Unable to install VyOS: {err}')
         # unmount filesystems and clenup
         try:
             if install_target is not None:
                 if is_raid_install(install_target):
                     cleanup_raid(install_target)
                 else:
                     cleanup([install_target.partition['efi'],
                              install_target.partition['root']],
                             ['/mnt/installation'])
         except Exception as err:
             print(f'Cleanup failed: {err}')
 
         exit(1)
 
 
 @compat.grub_cfg_update
 def add_image(image_path: str, no_prompt: bool = False) -> None:
     """Add a new image
 
     Args:
         image_path (str): a path to an ISO image
     """
     if image.is_live_boot():
         exit(MSG_ERR_LIVE)
 
     # fetch an image
     iso_path: Path = image_fetch(image_path, no_prompt)
     try:
         # mount an ISO
         Path(DIR_ISO_MOUNT).mkdir(mode=0o755, parents=True)
         disk.partition_mount(iso_path, DIR_ISO_MOUNT, 'iso9660')
 
         # check sums
         print('Validating image checksums')
         if not Path(DIR_ISO_MOUNT).joinpath('sha256sum.txt').exists():
             cleanup()
             exit(MSG_ERR_IMPROPER_IMAGE)
         if run(f'cd {DIR_ISO_MOUNT} && sha256sum --status -c sha256sum.txt'):
             cleanup()
             exit('Image checksum verification failed.')
 
         # mount rootfs (to get a system version)
         Path(DIR_ROOTFS_SRC).mkdir(mode=0o755, parents=True)
         disk.partition_mount(f'{DIR_ISO_MOUNT}/live/filesystem.squashfs',
                              DIR_ROOTFS_SRC, 'squashfs')
 
         cfg_ver: str = image.get_image_tools_version(DIR_ROOTFS_SRC)
         version_name: str = image.get_image_version(DIR_ROOTFS_SRC)
 
         disk.partition_umount(f'{DIR_ISO_MOUNT}/live/filesystem.squashfs')
 
         if cfg_ver < SYSTEM_CFG_VER:
             raise compat.DowngradingImageTools(
                 f'Adding image would downgrade image tools to v.{cfg_ver}; disallowed')
 
         if not no_prompt:
             image_name: str = ask_input(MSG_INPUT_IMAGE_NAME, version_name)
             set_as_default: bool = ask_yes_no(MSG_INPUT_IMAGE_DEFAULT, default=True)
         else:
             image_name: str = version_name
             set_as_default: bool = True
 
         # find target directory
         root_dir: str = disk.find_persistence()
 
         # a config dir. It is the deepest one, so the comand will
         # create all the rest in a single step
         target_config_dir: str = f'{root_dir}/boot/{image_name}/rw/opt/vyatta/etc/config/'
         # copy config
         if no_prompt or migrate_config():
             print('Copying configuration directory')
             # copytree preserves perms but not ownership:
             Path(target_config_dir).mkdir(parents=True)
             chown(target_config_dir, group='vyattacfg')
             chmod_2775(target_config_dir)
             copytree('/opt/vyatta/etc/config/', target_config_dir,
                      dirs_exist_ok=True)
         else:
             Path(target_config_dir).mkdir(parents=True)
             chown(target_config_dir, group='vyattacfg')
             chmod_2775(target_config_dir)
             Path(f'{target_config_dir}/.vyatta_config').touch()
 
         target_ssh_dir: str = f'{root_dir}/boot/{image_name}/rw/etc/ssh/'
         if no_prompt or copy_ssh_host_keys():
             print('Copying SSH host keys')
             Path(target_ssh_dir).mkdir(parents=True)
             host_keys: list[str] = glob('/etc/ssh/ssh_host*')
             for host_key in host_keys:
                 copy(host_key, target_ssh_dir)
 
         # copy system image and kernel files
         print('Copying system image files')
         for file in Path(f'{DIR_ISO_MOUNT}/live').iterdir():
             if file.is_file() and (file.match('initrd*') or
                                    file.match('vmlinuz*')):
                 copy(file, f'{root_dir}/boot/{image_name}/')
         copy(f'{DIR_ISO_MOUNT}/live/filesystem.squashfs',
              f'{root_dir}/boot/{image_name}/{image_name}.squashfs')
 
         # unmount an ISO and cleanup
         cleanup([str(iso_path)])
 
         # add information about version
         grub.version_add(image_name, root_dir)
         if set_as_default:
             grub.set_default(image_name, root_dir)
 
     except Exception as err:
         # unmount an ISO and cleanup
         cleanup([str(iso_path)])
         exit(f'Whooops: {err}')
 
 
 def parse_arguments() -> Namespace:
     """Parse arguments
 
     Returns:
         Namespace: a namespace with parsed arguments
     """
     parser: ArgumentParser = ArgumentParser(
         description='Install new system images')
     parser.add_argument('--action',
                         choices=['install', 'add'],
                         required=True,
                         help='action to perform with an image')
     parser.add_argument('--no-prompt', action='store_true',
                         help='perform action non-interactively')
     parser.add_argument(
         '--image-path',
         help='a path (HTTP or local file) to an image that needs to be installed'
     )
     # parser.add_argument('--image_new_name', help='a new name for image')
     args: Namespace = parser.parse_args()
     # Validate arguments
     if args.action == 'add' and not args.image_path:
         exit('A path to image is required for add action')
 
     return args
 
 
 if __name__ == '__main__':
     try:
         args: Namespace = parse_arguments()
         if args.action == 'install':
             install_image()
         if args.action == 'add':
             add_image(args.image_path, args.no_prompt)
 
         exit()
 
     except KeyboardInterrupt:
         print('Stopped by Ctrl+C')
         cleanup()
         exit()
 
     except Exception as err:
         exit(f'{err}')