Use the following instructions:
Install the repository in one of the following ways:
Install the playdeb package.
Or configure the repository manually:
Go to System-Administration-Software Sources, Third-Party Software tab, Add:
deb http://archive.getdeb.net/ubuntu ${codename}-getdeb games
Add the repository GPG key, open a terminal window and type:
wget -q -O- http://archive.getdeb.net/getdeb-archive.key | sudo apt-key add -
Click the "Install this now" button below the screenshot of the desired game.
If you are using Kubuntu please check bug 476853.
If the game cannot be found, run this command and try again:
sudo apt-get update
If you want to uninstall the PlayDeb repository run this command:
sudo apt-get remove playdeb