Install

[wilinux]

Thank you joevenzon for giving the information..
Basically I have also same problem.

Sorry for rezzing an old thread, but this issue is typically resolved by adding PlayDeb as a repository. You can find out how to at http://www.playdeb.net/updates/Ubuntu/12.04 It is quite simple. Hope this helps someone out...

Also, you can do it manually:

Go to System-Administration-Software Sources, Third-Party Software tab, Add:
deb http://archive.getdeb.net/ubuntu precise-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.

After this, run this in your teminal:
sudo apt-get update

Should work for you now!