I'm sorry I'm new to Ubuntu so I'll try be as descriptive as possible. At the moment my mouse is working when plugged into a specific USB port on the back of my PC. However when I move it to another port it doesn't work. If I plug my keyboard into this same USB port then the keyboard will work and the mouse won't. I have my system on a dual boot at the moment and I know for a fact that both the mouse and keyboard do work, it's only when I reach the login screen that I have issues with my keyboard/mouse. I have tried other solutions given on this site and elsewhere but they don't seem to work. Like I said I'm new to Ubuntu and Linux as a whole so I'm sorry if this is an obvious question.