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[ubuntu] 12.04 won't show wireless networks

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linux-howto

http://ubuntuforums.org – I'm using an eee netbook, dual boot with xp. The computer help desk at my university installed ubuntu for me about a year ago. I upgraded to 12.04 recently. After the upgrade, when I clicked on the wireless icon (the antenna symbol near the upper right corner of the screen), it was very slow to come up with a list of available networks. It has gotten worse, now it takes so long (minutes) that I just give up go back to windows. How can I fix this? (Hardware)