I am using Gnome-shell and GDM. This also happening to me but and i am not using LightDM. I get errors when logging in to Gnome-classic but it doesn't crash. Also as long as i do not touch the activities button gnome-shell works.
** Attachment added: ".xsession-errors" https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/797078/+attachment/2191108/+files/.xsession-errors -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/797078 Title: metacity crashed with SIGABRT in raise() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/metacity/+bug/797078/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs