I've been using ubuntu for about 8 years, but all things considered I'm still quite a newb. My mouse has suddenly stopped working on my Dell Inspiron 1545 laptop. It works fine on other computers. Switching mice doesn't help either. The touchpad also works fine.
I ran sudo apt-get update and apt-get upgrade. Any idea where to go from here? Please respond with the exact terminal commands I should use to help diagnose and/or fix the problem.