[ubuntu] Ubuntu 12.04 continually asks for login credentials.

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http://ubuntuforums.org – Hello, I've had Ubuntu installed for a few months,and have stopped using it since It can't connect to the internet. I have a Intel(R) Centrino(R) Advanced-N 6205 wireless card in my Thinkpad X220. When I first login I am able to be online for a few moments then it drops and asks me for my login and password every two minutes. Anyone have suggestions that I can accomplish while offline? I attend university and I'm on their WPA connection with zero issues while on Windows. (Hardware)