[ubuntu] Wired Connection Problem

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http://ubuntuforums.org – I have a dell latitude 2100 running ubuntu 11.1. Wireless internet works fine on it but wired connections do not. When I plug a ethernet cord in, it keeps on saying wired connection connected followed by disconnected. When I check the ethernet connection in the network part of system settings, it also keeps rapidly changing to on/off. I really need an ethernet connection so I can share my wifi with my desktop. (Hardware)