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So after I start any game (for example Starbound or FEZ) on my Xubuntu installation, after 5 minutes my computer just shuts down without even displaying a warning.

Does anyone know what could be causing this and how it could be fixed? Thanks in advance.

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could you check you CPU temperature? Install lm-sensors and type sensors in the terminal while the game is running. –  Presbitero Jan 3 at 17:26
    
see the shutdown log file askubuntu.com/questions/58625/where-is-the-shutdown-log –  Avinash Raj Jan 3 at 17:27
    
This looks very familiar to me. I guess your GPU is generating to much heat. Your system goes down preventing damage to your hardware. –  OrangeTux Jan 3 at 17:27
    
I had a problem like that and I solved it from ram optimization. My computer used to much ram memory, check it for your problem ;) –  user231397 Jan 3 at 17:28
    
I'll check it out. Could you link me to a guide on how to optimize RAM? –  kyr Jan 3 at 17:30

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