[ubuntu] Acer Aspire 7520G with Ubuntu 10.04 LTS problems with wireless

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http://ubuntuforums.org – Hello people, I'm new to ubuntu and I have installed Ubuntu 10.04 LTS (awesome OS) I haven't found any problem with it except for the fact that after about 1 hour of browsing the internet, watching videos online, listening to music or talking on Skype my wireless automatically disconnects. I have searched for the problem and already tried the rfkill solution with no good, 'rfkill list' shows me that nothing is blocked yet I can't connect to the wireless. I have tried 'sudo apt-get install linux-backports-modules-wireless-lucid-generic' as well with no luck. Shutting down and restarting my la (Hardware)