Thank you Sebastian for your reply.
I am sorry, but it is not possible for me to go back to the pre-
full-upgrade state to try what you suggest.
Anyway, as shown by the extracts quoted, "apt full-upgrade" announced it
was going to remove both libssl3(:amd64 by default on my system) and
libssl3:i386, and install libssl3t64(:amd64) and libssl3t64:i386
instead. So the presence of obsolete packages does not seem to have
interfered.
By looking in the full log for instances of other libraries that had
both :amd64 and :i386 versions, and that were going to be removed in
spite of apparent "dependency problems", I noticed that the installation
of the replacement t64:amd64 version sometimes happened much later than
the removal.
So, my understanding is that, unfortunately, the postgresql-16 install
script error interrupted the full-upgrade before libssl3t64:amd64 had
been installed, which left the system without the libcrypto.so.3 needed
by both systemctl and sudo...
Jean-Guilhem
