I have a triple installation: Ubuntu 12.04, Ubuntu 11.04 and Windows Vista. After installing 12.04 in a separate partition, when I boot 12.04 my keyboard is not (always) recognised.
The only thing I can do then is to reboot, and most of the time after the reboot, the keyboard again works normally. I already tried changing the batteries of the wireless keyboard (logitech K340). I don't have this problem with Vista or 11.04, so I think the reason for this happening must be found somewhere in 12.04 (unity 2D). Does anyone have any idea or a solution?