I tested an upgrade from xenial to bionic today and did not receive a conffile prompt regarding /etc/cron.daily/apt-compat and part of the output you've pasted leads me to believe the file did not exist on the system which you were upgrading. Have you run into this any more?
Additionally, I've sorted out the issue in ubuntu-release-upgrader for Eoan. If you want it SRU'ed let us know. ** Changed in: apt (Ubuntu Eoan) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1796193 Title: unattended do-release-upgrade asks about /etc/cron.daily/apt-compat To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1796193/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs