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OpenJK requires a copy of Jedi Knight: Jedi Academy. You can also use this for Jedi Outcast (singleplayer only), which requires a copy as well. The default folder that the game will search for files is Jedi Academy: ~/.local/share/openjk Jedi Outcast: ~/.local/share/openjo You can easily link your game files by doing the following: cd ~/.local/share/openjk mkdir base ln -s /path/to/game/GameData/base/* base