Nexuiz is one of the most popular open-source first person shooter games. It’s been in development for a long time, and the new 2.4 release has added a new menu system that’s easier to use, improved 3d effects, more game content, and improved performance. The version included in the Ubuntu repositories is now out of date, so you’ll need to install version 2.4 manually.
Download the Nexuiz 2.4 archive (approximately 300 MB) to your home directory:
wget -P ~ http://superb-east.dl.sourceforge.net/sourceforge/nexuiz/nexuiz-24.zip
Extract the archive: