My Ubuntu installation had been getting rather touchy and unstable so I eventually bit the bullet and went for a total system nuke and reinstall. After a royal screw up I got my system reinstalled. The CD image I downloaded got corrupted on the wire but still worked, one of the core Gnome packages got modified and the MD5SUM checking failed and it refused to install. So, I got left with a broken installer and a text mode system, eventually I managed to get Gnome up and redownload the ISO and reburn (verifying the MD5SUM of the ISO before this time) and reinstalled again and it worked first time, even though I did fall asleep.
Now my next problem is finding a media player I like, looks like I might be going back to mpd, which is the root of all my problems I think.