It's probably this upstream GNOME bug https://bugzilla.gnome.org/show_bug.cgi?id=660922.
** Bug watch added: GNOME Bug Tracker #660922 https://bugzilla.gnome.org/show_bug.cgi?id=660922 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/933332 Title: super key randomly stops working on gnome3 shell To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/933332/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
