Comment 7 for bug 1877088

This is bad, it should be quite impossible to get /boot/initrd.img & /boot/vmlinuz symlinks out of sync!

The only relevant thing that I can think of is us dropping the /etc/kernel-img.conf file

Previously, /etc/kernel-img.conf contained

# Kernel image management overrides
# See kernel-img.conf(5) for details
do_symlinks = yes
do_bootloader = no
do_initrd = yes
link_in_boot = yes

on s390x, whilst "link_in_boot" default was no. We changed that, and make "link_in_boot" default to 1 everywhere and that's reflected in /usr/share/perl5/DebianLinux.pm

As an experiment, can you please create /etc/kernel-img.conf as shown above and let me know if that "fixes" things?

I'll try to trace this further myself as well.