Thanks for doing the digging to confirm the cause; I suspect unattended- upgrades should be modified to perform something similar to apt upgrade, rather than apt-get upgrade, and bring in new dependencies when necessary. A lot of systems never have interactive users any more.
Thanks ** Changed in: unattended-upgrades (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/1963751 Title: focal security update 2.34.6-0ubuntu0.20.04.1 cannot be automatically installed due to new dependency To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1963751/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs