2011-08-13, 19:35
there is no stable ppa for Natty, however the unstable is usable and in my opnion pretty damn stable for the most part.
sudo add-apt-repository ppa:team-xbmc/unstable
sudo apt-get update
sudo apt-get install xbmc
sudo apt-get update
sudo apt-get upgrade
sudo add-apt-repository ppa:team-xbmc/unstable
sudo apt-get update
sudo apt-get install xbmc
sudo apt-get update
sudo apt-get upgrade