I installed 12.04 and it was working perfectly, but since yesterday I encountered a problem.
When I press left Ctrl key, it doesn't respond but when I press Fn key, it works as a Ctrl key and loses its own functioning.
Same with the Delete key it works as a Pause Break key and Pause Break key is working as a Delete key.
NumLock key is working as a PrtScr key.
After updating my OS, the problem is still happening. Please tell me what to do.