I forgot to say that before that screenshot there is a filesystem check, which usually ends with "The filesystem is clean [ok]". This is also mentioned in some of the Google hits.
It's not so easy to take a screenshot while the filesystem check is going on because when it ends the screen is refreshed and you get the "hanging" screenshot above. The Google hits suggest, and I also have a feeling that, not all reboot produce this behavior, but possibly only the first boot of the day. -- boot process interrupted by "could not kill pid 1984" https://launchpad.net/bugs/81395 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
