XBMC Media Center currently doesn’t have a Maverick repository. So, to install it in Ubuntu 10.10 you need to do a
sudo add-apt-repository ppa:team-xbmc
then Alt+F2 and type synaptic then hit enter. In Synaptic go to Settings > Repositories > Other Software and edit the two lines referring to XBMC. Instead of maverick type lucid in the Distribution field.. Click OK then open up a Terminal and type
sudo apt-get update && sudo apt-get install xbmc xbmc-standalone
Superb, worked first time 🙂 spent a long time last night trying to get it to work. 5 minutes with this.