Today it happened again. So I followed the instructions above and here it's the backtrace. Hope it helps.
** Attachment added: "screenlog.0" https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1060052/+attachment/3426996/+files/screenlog.0 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1060052 Title: gnome shell freezes on startup. intermittent To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1060052/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs