I've met the same problem. This is the xev (Xorg) output when pressing Alt+Shift+R. There is no KeyPress event for pressing 'R'.
** Attachment added: "xev_output" https://bugs.launchpad.net/ubuntu/+bug/2093833/+attachment/5855740/+files/xev_output -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2093833 Title: Alt+Shift+R key combination unresponsive To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/2093833/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs