Ok so far i have been using Ubuntu 12.04 without any problem, but one the mouse clicker just don't work when i select something. Now it works when i am opening up a program, but to lets say i want to open up the file manager. I got to right click then select open then hit enter to open it and that goes for any thing else i want to open, what i am asking is how can i restore its functionality.
Try running the following command:
Restart and test if it works.