Public bug reported: Before trying this I suggest you to close all your important things! After this test you can reach (with a bit of luck) the terminal by pressing Ctrl+Alt+F1 to reboot your System!
For me this affects Ubuntu 14.04.5 with the Unity Desktop... The freezing hotkeysequence is: Ctrl+Alt+F8 Ctrl+Alt+F1 Ctrl+Alt+F7 (returns to GUI, but now is freezed) ** Affects: at-spi2-core (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1685288 Title: Unity freeze by hotkeysequence - be warned To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/at-spi2-core/+bug/1685288/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs