[lubuntu] can't figure out wifi

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http://ubuntuforums.org – Okay i'm a total newbie, and I have no stinkin' idea where to start. i was given a computer with the Lubuntu OS on it, and i'm starting from scratch. I need help. Is my wifi even on? Please excuse my lack of computer expertise, -I'm learning! I'm on the internet via an ethernet cable. (Hardware)