I think the client (X) crashed on an exception because the server (Mir /unity-system-compositor) has died.
Can you please attach /var/log/lightdm/unity-system-compositor.log* ? ** Changed in: xmir Status: New => Incomplete ** Changed in: xorg-server (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1222996 Title: [xmir] Xorg crashed with SIGABRT in __gnu_cxx::__verbose_terminate_handler() To manage notifications about this bug go to: https://bugs.launchpad.net/xmir/+bug/1222996/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs