[ubuntu] The Cave for Linux (c) Double Fine -HI2U not working

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http://ubuntuforums.org – Hi i downloaded The Cave for Linux (c) Double Fine -HI2U from a trustworthy source. Now i would like to play it but it does not work First i did Unrar, to unpack the archive to my documents folder, Then i tried to run the game using ./run_game.sh As exlpained in the tutorial. The package i download is 100 intact and not damaged. Via cd Documents i went to install folder then i did ./run_game.sh Maybe i need to install other packages? How do i do this ? My laptop is an aspire 5538g AMD Athlon(tm) X2 Dual Core Processor L310 × 2 32 bites OS Ubuntu offcourse (Hardware)