Already reported in https://vyos.dev/T6249 but closed there without any comment.
(I thought it was ok to report there because it was tagged for both 1.3 and 1.4, issues are different but similar - build depends on non-accessible remote repo.)
I have tried again, it still fails:
marekm@build:~/vyos-build$ git pull
Already up to date.
marekm@build:~/vyos-build$ sudo make clean
[2024-04-25 11:24:47] lb clean
P: Cleaning chroot
marekm@build:~/vyos-build$ sudo ./build-vyos-image iso --architecture amd64 --build-by "[email protected]"
I: Checking if packages required for VyOS image build are installed
build/config
I: Cleaning the build workspace
[2024-04-25 11:25:03] lb clean
P: Cleaning chroot
I: Setting up additional APT entries
I: Configuring live-build
[2024-04-25 11:25:03] lb config noauto --apt-indices false --apt-options --yes -oAPT::Get::allow-downgrades=true --apt-recommends false --architecture amd64 --archive-areas main contrib non-free --backports true --binary-image iso-hybrid --bootappend-live boot=live components hostname=vyos username=live nopersistence noautologin nonetworking union=overlay console=ttyS0,115200 console=tty0 net.ifnames=0 biosdevname=0 --bootappend-live-failsafe live components memtest noapic noapm nodma nomce nolapic nomodeset nosmp nosplash vga=normal console=ttyS0,115200 console=tty0 net.ifnames=0 biosdevname=0 --bootloaders syslinux,grub-efi --checksums sha256 md5 --chroot-squashfs-compression-type xz -Xbcj x86 -b 256k -always-use-fragments -no-recovery --debian-installer none --debootstrap-options --variant=minbase --exclude=isc-dhcp-client,isc-dhcp-common,ifupdown --include=apt-utils,ca-certificates,gnupg2 --distribution bookworm --firmware-binary false --firmware-chroot false --iso-application VyOS --iso-publisher [email protected] --iso-volume VyOS --linux-flavours amd64-vyos --linux-packages linux-image-6.6.28 --mirror-binary http://deb.debian.org/debian --mirror-binary-security http://deb.debian.org/debian-security --mirror-bootstrap http://deb.debian.org/debian --mirror-chroot http://deb.debian.org/debian --mirror-chroot-security http://deb.debian.org/debian-security --security true --updates true
P: Updating config tree for a debian/bookworm/amd64 system
P: Symlinking hooks...
I: Starting image build
[2024-04-25 11:25:03] lb build
P: live-build 20230502
P: Building for a debian/bookworm/amd64 system
[2024-04-25 11:25:03] lb bootstrap
P: Setting up clean exit handler
[2024-04-25 11:25:03] lb bootstrap_cache restore
P: Restoring bootstrap stage from cache...
[2024-04-25 11:25:03] lb bootstrap_debootstrap
P: Begin bootstrapping system...
W: Skipping bootstrap, already done
[2024-04-25 11:25:03] lb bootstrap_cache save
P: Saving bootstrap stage to cache...
[2024-04-25 11:25:04] lb chroot_prep install all-except-archives
[2024-04-25 11:25:04] lb chroot_devpts install
P: Begin mounting /dev/pts...
[2024-04-25 11:25:04] lb chroot_proc install
P: Begin mounting /proc...
[2024-04-25 11:25:04] lb chroot_selinuxfs install
[2024-04-25 11:25:04] lb chroot_sysfs install
P: Begin mounting /sys...
[2024-04-25 11:25:04] lb chroot_debianchroot install
P: Configuring file /etc/debian_chroot
[2024-04-25 11:25:04] lb chroot_dpkg install
P: Configuring file /sbin/start-stop-daemon
dpkg-divert: warning: diverting file '/sbin/start-stop-daemon' from an Essential package with rename is dangerous, use --no-rename
[2024-04-25 11:25:04] lb chroot_tmpfs install
[2024-04-25 11:25:04] lb chroot_sysv-rc install
P: Configuring file /usr/sbin/policy-rc.d
[2024-04-25 11:25:04] lb chroot_hosts install
P: Configuring file /etc/hosts
[2024-04-25 11:25:04] lb chroot_resolv install
P: Configuring file /etc/resolv.conf
[2024-04-25 11:25:04] lb chroot_hostname install
P: Configuring file /etc/hostname
P: Configuring file /bin/hostname
dpkg-divert: warning: diverting file '/bin/hostname' from an Essential package with rename is dangerous, use --no-rename
[2024-04-25 11:25:04] lb chroot_apt install
P: Configuring file /etc/apt/apt.conf
[2024-04-25 11:25:04] lb bootstrap_archives
P: Configuring file /etc/apt/sources.list
Get:1 http://security.debian.org/debian-security buster/updates InRelease [34.8 kB]
Hit:2 http://deb.debian.org/debian bookworm InRelease
Get:3 http://deb.debian.org/debian-security bookworm-security InRelease [48.0 kB]
Get:4 https://repo.saltproject.io/py3/debian/11/amd64/3005 bullseye InRelease [2853 B]
Get:5 http://security.debian.org/debian-security buster/updates/main amd64 Packages [596 kB]
Get:6 http://deb.debian.org/debian bookworm-updates InRelease [55.4 kB]
Get:7 http://deb.debian.org/debian bookworm-backports InRelease [56.5 kB]
Get:8 http://deb.debian.org/debian buster InRelease [122 kB]
Get:10 http://security.debian.org/debian-security buster/updates/main Translation-en [322 kB]
Get:11 http://security.debian.org/debian-security buster/updates/non-free amd64 Packages [11.0 kB]
Get:12 http://security.debian.org/debian-security buster/updates/non-free Translation-en [24.8 kB]
Get:13 http://deb.debian.org/debian buster-updates InRelease [56.6 kB]
Get:14 http://deb.debian.org/debian trixie InRelease [158 kB]
Get:15 http://deb.debian.org/debian trixie-updates InRelease [45.1 kB]
Get:16 http://deb.debian.org/debian bookworm/main Sources [9489 kB]
Err:9 https://sagitta-packages.vyos.net sagitta InRelease
403 Forbidden [IP: 2606:4700::6812:1f4f 443]
Get:17 http://deb.debian.org/debian bookworm/main Translation-en [6109 kB]
Get:18 http://deb.debian.org/debian-security bookworm-security/main Sources [91.5 kB]
Get:19 http://deb.debian.org/debian-security bookworm-security/main amd64 Packages [155 kB]
Get:20 http://deb.debian.org/debian-security bookworm-security/main Translation-en [94.3 kB]
Get:21 http://deb.debian.org/debian bookworm-updates/main Sources [17.9 kB]
Get:22 http://deb.debian.org/debian bookworm-updates/main amd64 Packages [13.8 kB]
Get:23 http://deb.debian.org/debian bookworm-updates/main Translation-en [16.0 kB]
Get:24 http://deb.debian.org/debian bookworm-backports/main Sources [204 kB]
Get:25 http://deb.debian.org/debian bookworm-backports/main amd64 Packages [192 kB]
Get:26 http://deb.debian.org/debian bookworm-backports/main Translation-en [161 kB]
Get:27 http://deb.debian.org/debian buster/main amd64 Packages [7909 kB]
Get:28 https://repo.saltproject.io/py3/debian/11/amd64/3005 bullseye/main amd64 Packages [2924 B]
Get:29 http://deb.debian.org/debian buster/main Translation-en [5969 kB]
Get:30 http://deb.debian.org/debian buster/non-free amd64 Packages [87.8 kB]
Get:31 http://deb.debian.org/debian buster/non-free Translation-en [88.9 kB]
Get:32 http://deb.debian.org/debian buster-updates/main amd64 Packages [8788 B]
Get:33 http://deb.debian.org/debian buster-updates/main Translation-en [6915 B]
Get:34 http://deb.debian.org/debian trixie/main amd64 Packages [8871 kB]
Get:35 http://deb.debian.org/debian trixie/main Translation-en [5999 kB]
Get:36 http://deb.debian.org/debian trixie/non-free amd64 Packages [98.3 kB]
Get:37 http://deb.debian.org/debian trixie/non-free Translation-en [67.7 kB]
Reading package lists... Done
E: Failed to fetch http://dev.packages.vyos.net/repositories/sagitta/dists/sagitta/InRelease 403 Forbidden [IP: 2606:4700::6812:1f4f 443]
E: The repository 'http://dev.packages.vyos.net/repositories/sagitta sagitta InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Repository 'Debian bookworm' changed its 'non-free component' value from 'non-free' to 'non-free non-free-firmware'
N: More information about this can be found online in the Release notes at: https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.html#non-free-split
E: An unexpected failure occurred, exiting...
P: Begin unmounting filesystems...
P: Saving caches...
Reading package lists... Done
Building dependency tree... Done
marekm@build:~/vyos-build$