After an entire day of fiddling and swearing, I went to look in the logfiles, which included some line about PAM: 18:39:01 gdm-session-wor: PAM adding faulty module: pam_sss.so The absolute last thing I had done before the first reboot that gave me this issue, was install the software for the Belgian eid, which apparently breaks something in the keyring, leading to this very unusual behavior. My bad, false alarm.
** Changed in: gdm3 (Ubuntu) Status: New => Invalid -- 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/2003610 Title: Cannot log in, keeps asking username To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/2003610/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs