Edit /etc/apt/sources.list

$gksudo gedit /etc/apt/sources.list

deb http://archive.getdeb.net/ubuntu karmic-getdeb games

$wget -c http://archive.getdeb.net/getdeb-archive.key

$sudo apt-key add getdeb-archive.key

$sudo  apt-get update

done :)

now u can install nexuiz, this game like counter strike

$sudo apt-get install nexuiz 

 

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