[ubuntu] Wireless Network Disconnected

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http://ubuntuforums.org – My ubuntu 12.04 LTS never connected to my router wirelessly. I have to use a wired connection with an ethernet cable. The router is directly next to my PC. And the wireless connection works fine for everyone else in the house, two other Windows and an Apple Mac, and for my Windows package installed dually with Ubuntu. How can I fix this? (Hardware)