Actually it sounds like the machine is busy dumping/reporting a crash. Do you find any files in /var/crash ?
** Changed in: gdm3 (Ubuntu) Status: Confirmed => Incomplete ** Changed in: linux (Ubuntu) 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/1756092 Title: Screen freeze for some time when unlocking To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm3/+bug/1756092/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs