byzantium image includes obsolete packages
the disk image Build 6990 'luks librem5r3 byzantium image' from Mon Mar 15 16:53:29 2021 includes a few excess packages:
bsdmainutils is a transient package - two of its 4 replacement packages are essential, one is pulled in by man-db, and the last is arguably irrevant: ncal
The last 4 of the above packages were seemingly obsoleted by the removal of rsyslog during image build.
I found the list by explicitly going through all installed packages with aptitude, but probably at least some of them can be automatically dropped with
apt autoremove (not sure - I mainly use aptitude...).