Hi, I saw that message today while upgrading bookworm RC3 to RC4:
[...] Setting up console-setup-linux (1.221) ... insserv: FATAL: service mountkernfs has to be enabled to use service keyboard-setup.sh [...]
Note: The system was recently upgraded from Debian 8 (without systemd) to Debian 9 (where I switched to systemd) to Debian 12.
In my case it looks like insserv was a leftover of
$ aptitude why insserv i chkconfig Recommends insserv
I purged both packages. -- Regards, Thomas
