Two Ubuntu users: Steven and, Hulvia, his 79-year old mother-in-law. One of the great Linux desktop myths is that it's hard to use. People still think that you need to be some kind of mad computer wizard to use Linux. What nonsense. Desktop Linux has been as easy to use as any of the mainstream desktop operating systems for over a decade. How easy is it? My 79-year old mother-in-law, Hulvia, can use it. She arrived a few weeks ago with her Windows laptop, but without her power cord. So, she nee...