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[ubuntu] Ubuntu 10.10 won't stay connected to wireless internet

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http://ubuntuforums.org – Hi everyone, I am running Ubuntu 10.10 on a Dell Dimension 4700 desktop computer. I just upgraded to 10.10 from the previous version after getting my D-Link wireless adapter back after loaning it out. My internet now won't stay connected. I can connect when I first turn on the computer, with after 2-5 minutes it drops the connection and gives me the "Wireless Network Authentication Required" prompt. It won't connect again without unplugging the adapter and plugging it back in. I borrowed a Belkin wirelss adapter to try it, and it does the exact same thing. PLEASE can someone help m (HowTos)