I also confirm that replacing /etc/init/gdm.conf by the file provided in comment #3 by Martin corrected the issue.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gdm in ubuntu. https://bugs.launchpad.net/bugs/735805 Title: GDM fails to start -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs