Hello again,
I believe, that one of the following packages needs the missing package. Please see the last output (sorry, it is bit longer):
Building dependency tree... Done
Reading state information... Done
The following additional packages will be installed:
dmsetup gcc-12-base gettext-base grub-common libbrotli1 libc6 libdevmapper1.02.1 libefiboot1 libefivar1 libfreetype6
libfuse2 libgcc-s1 liblzma5 libpcre2-8-0 libpng16-16 libselinux1 libudev1 zlib1g
Suggested packages:
multiboot-doc grub-emu mtools xorriso desktop-base console-setup glibc-doc debconf | debconf-2.0 libc-l10n locales
libnss-nis libnss-nisplus fuse
Recommended packages:
os-prober grub-efi-amd64-signed efibootmgr libidn2-0
The following NEW packages will be installed:
dmsetup gcc-12-base gettext-base grub-common grub-efi-amd64-bin libbrotli1 libc6 libdevmapper1.02.1 libefiboot1
libefivar1 libfreetype6 libfuse2 libgcc-s1 liblzma5 libpcre2-8-0 libpng16-16 libselinux1 libudev1 zlib1g
0 upgraded, 19 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/9398 kB of archives.
After this operation, 56.3 MB of additional disk space will be used.
Download complete and in download only mode
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done E: Unable to locate package grub-efi-amd64-unsigned
E: An unexpected failure occurred, exiting...
P: Begin unmounting filesystems...
P: Saving caches...
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
protheus1:/space/DebianLive/live-build-config#
IMO one of the "recommended" or "NEW packages" can not be installed and causes the break. As far as I know, in the past there were two packages existent: grub-efi-amd64-unsigned and grub-efi-amd64-signed. Maybe the latter one is the succesor of the unsigned package and so somehow there is a false entry of the dependency entry?
On the other hand, there is another weired thing: On a native installed debian/stable system, it is not possible, to download packages like "grub-common" or "grub-efi-amd64-signed". Take a look:
# LANG=C apt-get update
Hit:1 http://deb.debian.org/debian-security bookworm-security InRelease
Hit:2 http://ftp.de.debian.org/debian bullseye InRelease
Hit:3 http://deb.debian.org/debian bookworm InRelease
Hit:4 http://deb.debian.org/debian bookworm-updates InRelease
Hit:5 http://deb.debian.org/debian bullseye-updates InRelease
Hit:6 https://artifacts.elastic.co/packages/8.x/apt stable InRelease
Hit:7 https://linux.teamviewer.com/deb stable InRelease
Reading package lists... Done
# LANG=C apt-get -d --reinstall install grub-efi-amd64-signed grub-common
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Reinstallation of grub-efi-amd64-signed is not possible, it cannot be downloaded.
Reinstallation of grub-common is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 19 not upgraded.
Something weired is going on. Maybe due to the next release of trixie???
Hope this helps.
Best
Hans