When performing an image upgrade and Linux Kernel command-line option that should be passed via Grub is missing on the first boot:
##Reproduce
* Check setting (e.g. `disable-mitigations`) is enabled
```
vyos@vyos:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/1.4.1/vmlinuz boot=live rootdelay=5 noautologin net.ifnames=0 biosdevname=0 vyos-union=/boot/1.4.1 mitigations=off console=ttyS0,115200 console=tty0
```
* Upgrade image 1.4.1 -> 1.4.2
```
vyos@vyos:~$ add sys im /tmp/vyos-1.4.2-generic-amd64.iso
The file is 454.000 MiB.
[##############################################################################################################################################################################################################################################################################################################] 100%
Validating signature
Signature is valid
Validating image checksums
What would you like to name this image? (Default: 1.4.2)
Would you like to set the new image as the default one for boot? [Y/n]
An active configuration was found. Would you like to copy it to the new image? [Y/n]
Copying configuration directory
Would you like to copy SSH host keys? [Y/n]
Copying SSH host keys
Copying system image files
Cleaning up
Unmounting target filesystems
Removing temporary files
vyos@vyos:~$ reboot now
```
* Check if Kernel command-line parameter is presend -> fail
```
Welcome to VyOS!
┌── ┐
. VyOS 1.4.2
└ ──┘ sagitta
* Documentation: https://docs.vyos.io/en/sagitta
* Project news: https://blog.vyos.io
* Bug reports: https://vyos.dev
You can change this banner using "set system login banner post-login" command.
VyOS is a free software distribution that includes multiple components,
you can check individual component licenses under /usr/share/doc/*/copyright
vyos@vyos:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/1.4.2/vmlinuz boot=live rootdelay=5 noautologin net.ifnames=0 biosdevname=0 vyos-union=/boot/1.4.2 console=ttyS0,115200 console=tty0
```
* Reboot again - and check Kernel command-line options -> found
```
vyos@vyos:~$ reboot now
```
```
Welcome to VyOS!
┌── ┐
. VyOS 1.4.2
└ ──┘ sagitta
* Documentation: https://docs.vyos.io/en/sagitta
* Project news: https://blog.vyos.io
* Bug reports: https://vyos.dev
You can change this banner using "set system login banner post-login" command.
VyOS is a free software distribution that includes multiple components,
you can check individual component licenses under /usr/share/doc/*/copyright
Last login: Mon Apr 7 20:59:48 2025 from 172.16.33.104
vyos@vyos:~$ cat /proc/cmdline
BOOT_IMAGE=/boot/1.4.2/vmlinuz boot=live rootdelay=5 noautologin net.ifnames=0 biosdevname=0 vyos-union=/boot/1.4.2 mitigations=off console=ttyS0,115200 console=tty0
```