I don't know if this is relevant, but just in case: https://lists.ubuntu.com/archives/ubuntu-gnome/2013-March/000101.html
** Bug watch added: GNOME Bug Tracker #695081 https://bugzilla.gnome.org/show_bug.cgi?id=695081 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gdm in Ubuntu. https://bugs.launchpad.net/bugs/1162466 Title: GDM wont start on Ubuntu GNOME using Gnome3 ppa Status in “gdm” package in Ubuntu: New Bug description: I tried to upgrade to pre Gnome 3.8 by using the Gnome3 ppa, the update itself went well but when i restarted the only thing I got was the blue blinds background with a mouse courser, nothing else, no login promt. I tried hitting Ctrl-Alt-Del which brought up the log out dialog box and asked if I wanted to log out from GDM-session ? Strange... I tried pushing the power button once instead which brought up the shutdown dialog box telling me again I was logged in as GDM ? To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gdm/+bug/1162466/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp