Hey. Unfortunately the previous leftover conffiles haven't been cleaned up in the meantime.
And even more conffiles need to be added to that list, namely $ dpkg-query --showformat='${Package}\n${Conffiles}\n' --show | awk '/^[^ ]/{pkg=$1}/ obsolete$/{print pkg,$0}' | cut -d ' ' -f 1-3 | column -t fail2ban /etc/fail2ban/action.d/iptables-common.conf fail2ban /etc/fail2ban/action.d/badips.py fail2ban /etc/fail2ban/action.d/badips.conf which all three were left over when upgrading from bullseye to bookworm. Cheers, Chris.