It appears you're still using lightdm that is not part of bionic. It was part of xenial though, so that must be a leftover from the upgrade.
** Package changed: gdm (Ubuntu) => gdm3 (Ubuntu) ** Package changed: gdm3 (Ubuntu) => lightdm (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm3 in Ubuntu. https://bugs.launchpad.net/bugs/1773268 Title: locked out of system when upgrading to bionic from xenial To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1773268/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
