What Ubuntu version do you use? If it's Edgy can you retry after upgrading. There's a change in Metacity which could fix it.
If it still there look at Xorg.conf man page for : Option "AllowDeactivateGrabs" and Option "AllowClosedownGrabs" "boolean" If you get your keyboard back with Ctrl+Alt+Keypad-Divide then the next time with Ctrl+Alt+Keypad-Multiply you can find the culprit, ie the application grabing the keyboard, it will be kill... ** Changed in: Ubuntu Status: Unconfirmed => Needs Info -- Keyboard stops responding to most input https://launchpad.net/bugs/59208 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs