It seems that proposed packages make Ctrl+Shift hotkey usable in Unity and GNOME sessions. But Ctrl+Shift does not work in gnome-screensaver lock screen (https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1245270) and unity-greeter (https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug/1245268).
It seems that proposed packages make Ctrl+Shift hotkey usable in Unity and GNOME sessions. /bugs.launchpad .net/ubuntu/ +source/ gnome-screensav er/+bug/ 1245270) and unity-greeter (https:/ /bugs.launchpad .net/ubuntu/ +source/ unity-greeter/ +bug/1245268).
But Ctrl+Shift does not work in gnome-screensaver lock screen (https:/