I can't seem to boot Ubuntu from the CD. It goes through all the checkups and seems to be almost ready to go, but then something about a graphics error flashes up and is gone just as fast, replaced with a dos like interface. My computer is 5 years old and runs XP, so it should be able to run Ubuntu, right? I have an nvidia geforce 5200 graphics card. This is the first time I have tried linux, and I'd quite like to get it to run.