Since Debian 13, I've always been getting the following message under Systemd:
Configuration errors:
System is tainted: 1 time(s)
According to https://www.reddit.com/r/debian/comments/1d719nu/what_to_do_with_unmergedbin_taint_string/, this can be ignored.
I noticed that the following line is included in scripts/services/systemd:
} elsif (($reason,$service) = ($ThisLine =~ /^(System is tainted): (.*)$/)) {
Nevertheless, the above message is still displayed. I added the following additional line before it:
} elsif (($reason,$service) = ($ThisLine =~ /^(System is tainted): (unmerged-bin)$/)) {
Now the message is gone.
Thanks for the report. Error is hidden unless $Detail is 10 or higher.