We installed Ubuntu on all the machines in the computer lab. Apart from the students who already used Linux, who just argued over which distribution, the CS students who'd only been exposed to Windows unanimously expressed they hated Linux. I asked them why, what was wrong, and it always came back to the fact that it was unfamiliar. I'm not sure how you fix that, because in effect their gripe was that it was not "exactly like Windows". It's yet another bad effect of the Microsoft monopoly - people believe that Computer == Windows, because they don't get exposed to anything else.