This was probably actually a plymouth bug that was fixed not too long ago. It was hiding on one of your other vts waiting for <enter> to be hit, and then it'd kill your X session.
** Changed in: xserver-xorg-video-ati (Ubuntu) Status: New => Fix Released -- X windows freeze on startup https://bugs.launchpad.net/bugs/517213 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xserver-xorg-video-ati in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp