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meanwhile I watch videos via internet suddenly screen goes black and take me back to login screen after I type my password system begins as I've restarted my pc.all are power settings disabled from system settings.

I assume from logs thats the problem.

Apr 30 18:53:06 desktop AptDaemon: INFO: Quitting due to inactivity

Apr 30 18:53:06 desktop AptDaemon: INFO: Quitting was requested

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closed as off topic by Jorge Castro, hhlp, jrg Apr 30 '12 at 18:43

Questions on Ask Ubuntu are expected to relate to Ubuntu within the scope defined by the community. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about reopening questions here.If this question can be reworded to fit the rules in the help center, please edit the question.

    
This question should instead be filed as a bug report, thanks! Instructions here. –  Jorge Castro Apr 30 '12 at 15:53

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