[ubuntu] Wired connection problems with Ubuntu 10.04

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http://ubuntuforums.org – Hi, I can't seem to be able to connect to the internet in my Ubuntu 10.04 Dell Dimension E-310 desktop. I am able to connect to the router(a 2wire AT&T wireless gateway) with my UNR 10.10 Lenovo ideapad S10-3t both wired and wirelessly. I tried connecting manually to the router on my desktop using the eth0 connection but it still says "You are now offline" after a few seconds. Any help would be greatly appreciated. (HowTos)