I can reproduce this by simply touching the file '/forcefsck' and rebooting.
Killing either 'plymouth quit' or 'plymouth --mode=boot --attach-to- session' shows gdm again, all though kill 'plymouth --mode=boot --attach-to-session' spams the terminal with the following message: 'mountall: Plymouth command failed'. -- Graphical bootstrap hangs on fsck https://bugs.launchpad.net/bugs/554737 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs