I don't see why it should be necessary to install a new package from a PPA to address this regression in basic functionality.
** Changed in: gnome-control-center (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/882180 Title: Cannot set keyboard shortcut for "Lock Screen" Status in “gnome-control-center” package in Ubuntu: Confirmed Bug description: To reproduce: 1. Cog icon → System Settings… → Keyboard → "Shortcuts" tab. 2. Select "System" in left pane. 3. Double-click beside "Lock screen" in right pane. 4. Press Scroll Lock. 5. Exit gnome-control-center (Alt+F4) 6. Press Scroll Lock. Expected: The screen is locked. Observed: Nothing happens. $ lsb_release -rd && apt-cache policy gnome-control-center Description: Ubuntu 11.10 Release: 11.10 gnome-control-center: Installed: 1:3.2.1-0ubuntu1 Candidate: 1:3.2.1-0ubuntu1 Version table: *** 1:3.2.1-0ubuntu1 0 500 http://mirrors.mit.edu/ubuntu/ oneiric-updates/main amd64 Packages 100 /var/lib/dpkg/status 1:3.2.0-0ubuntu6 0 500 http://mirrors.mit.edu/ubuntu/ oneiric/main amd64 Packages To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/882180/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp