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Rubicon X is a free, cross platform, first person shooter that continues the story of Bungie’s Marathon trilogy. First released as Marathon:Rubicon in 2001, Rubicon X is a complete overhaul of the original. It features all new high-resolution artwork, new and updated maps, and enough surprises to feel like a whole new game.

The second point of the installation instruction given on the site is the other way round on Linux: you need to copy the contents of the Rubicon folder into the AlephOne folder, usually /usr/local/share/AlephOne and run alephone.