Please look in /var/crash for crashes. If there are none then log into a VT (if you can - Ctrl+Alt+F4) and run:
killall -ABRT gnome-shell Now look in /var/crash again. And upload the file using: ubuntu-bug /var/crash/_my_crash_report.crash ** Changed in: gnome-shell (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1730091 Title: session freezes/hangs after undetermined amount of time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1730091/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs