Ubuntu Linux is generally pretty good. I can do most of want I want from my computer with it, but I do seem to get a few strange issues. The latest was last night when it refused to start KDE. All I could get was a text mode log-in. The error messages said it was having problems with the NVidia driver. I re-installed that and all was well again, but why did it happen? Thanks to the Herts LUG team on IRC for their suggestions. I resorted to using the Windows PC to get on IRC, but could have used irssi from the terminal.
Other issues I have are that some keyboard functions are not working (Ctrl-Alt-Fx to switch sessions and can't get a £ sign), some issues with sound and the odd time when it doesn't shut down properly or just locks up. I can see on the forums that some of these are common, but others are not mentioned.
The next release, Dapper Drake 6.06, is due out next month. I'm considering a clean install with that in the hope that it will be better. There's a lot of new stuff there so it will be interesting to play with those.