This is why the general public doesn't run Linux. Say I want to install the XBMC media player in Windows or OSX. I click on the download link, and select 'Run'. That's it, job done. With Linux...
Before you run these comands type "sudo echo" into the terminal and hit Enter.
Then copy the area below up to sudo add...
Go back to the terminal, hit the middle mouse button and when it prompts hit Enter.
Copy the part after sudo add... and paste it to the terminal.
If it askes you if you want to install enter y and hit Enter
sudo apt-get install python-software-properties pkg-config
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:team-xbmc/ppa
sudo apt-get update
sudo apt-get install xbmc
Repositories
https://launchpad.net/~team-xbmc/+archive/ppa ppa:team-xbmc/ppa
https://launchpad.net/~team-xbmc/+archive/unstable ppa:team-xbmc/unstable
https://launchpad.net/~team-xbmc/+archive/xbmc-nightly ppa:team-xbmc/xbmc-nightly
Frodo is available from Ubuntu 11.10 (Oneiric Ocelot) to 13.04 (Raring Ringtail), you can install from the team-xbmc PPA as follows or replace the ppa with the desired from above.
sudo apt-get install python-software-properties pkg-config
sudo apt-get install software-properties-common
sudo add-apt-repository ppa:team-xbmc/ppa
sudo apt-get update
sudo apt-get install xbmc
For more details, see the HOW-TO install XBMC for Linux on Ubuntu, a Step-by-Step Guide.