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[ubuntu] Can't connect to wireless network [URGENT]

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http://ubuntuforums.org – Hi to everybody I'm not new to the forum, but I've been away for a long time and now I'm starting my Ubuntu experience all over again. I just installed Ubuntu on an external hard drive that I run from my MacBook Pro booting with rEFIt. Yesterday evening I installed it and I even downloaded few programs and everything was ok. Today I have absolute needing of the Internet (I'm in a different place) but I cannot connect to any network. The network symbol in the top right corner is "empty" and when I click on it I see the following: wired network (greyed) disconnected (gre (Hardware)