[ubuntu] Wired connection not working

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http://ubuntuforums.org – Hi all, I recently moved to a student dorm in my university (RWTH Aachen) and I have an ethernet connection from my room. The thing is that I can't connect to the internet, I don't get any IP through DHCP. I tried using wicd instead of network-manager, and doing it manually with dhclient. None of those worked (actually I don't know much about how networking works so maybe i didn't do it well with dhclient). The weird thing is that Windows 7 gets the IP instantly and I can connect to the internet from windows. But i don't know why Ubuntu refuses to get an IP. I don't know exactly which info (HowTos)