Package: installation-reports
Tags: d-i
Boot method: DVD
Image version: debian-13.0.0-amd64-DVD-1.iso (customized)
Date: 2025-08-10
Machine: Hyper-V / VirtualBox VM
Not sure whether this is classified as a Debian Installer or apt problem:
I've been creating a customized installation ISO image with a preseed file for several versions.
My configuration was working fine until Trixie, i.e. it works in <=Bookworm.
I copy a custom sources.list during installation with a late_command:
> d-i preseed/late_command string \
> cp /cdrom/custom/conf/sources.list /target/etc/apt/sources.list
The sources.list obviously doesn't contain the cdrom entries.
This breaks on Trixie, on step "Finish the installation", it will start prompting for an install media in a loop:
> Please insert the media labeled '<disk label>' and press enter.
> *Media change*
According to console output, this is caused by /usr/lib/finish-install.d/08hw-detect:
> finish-install: info: Running /usr/lib/finish-install.d/08hw-detect
> ...
> in-target: E: Unable to locate package hyperv-daemons
> load-install-cd: E: failed to mount the cdrom.
The virtualization packages (e.g. hyperv-daemons, virtualbox-guest-utils) are not even available on (at least) the DVD1 media?
Also, it should be able to find & mount my DVD by label too, because I configure it into $MEDIA/.disk/info (the error message displays the correct custom label for the media)
So, both errors appear to be irrelevant.
Regardless, as a workaround, I added a preseed early_command:
> d-i preseed/early_command string \
> rm /usr/lib/finish-install.d/08hw-detect
This fixes the preseed installation.
However, this results in virtualization tools and processor microcode packages not installing.