You may have had an old samba from 18.04 still installing, as a result of your release upgrade. Could you please run this command and show the output?
dpkg -l | grep -E "(samba|smb|registry-tools|winbind|libwbclient|ctdb)" ** Changed in: samba (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Server, which is subscribed to samba in Ubuntu. https://bugs.launchpad.net/bugs/1876622 Title: Can't upgrade samba-common-bin: undefined symbol: smb_strtoul To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/samba/+bug/1876622/+subscriptions -- Ubuntu-server-bugs mailing list Ubuntu-server-bugs@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-server-bugs