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[xubuntu] no wifi after new install xubuntu 11.10 and upgrade to 12.04

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http://ubuntuforums.org – I have installed Xubuntu on an oldish laptop with a fresh install of 11.10 (12.04 wouldn't install because of some kernel PAE conflict) and then upgrading immediately to 12.04. But the wifi is not working. (and I wasn't' smart enough to check whether it was working after the 11.10 as I had a wired ethernet connection running.) Oddly, pulling down the Networking icon (the up/down arrows) it shows Enable Wireless checked and enabled. but futher down I see a greyed out "wireless disabled" the firewall test shows "inactive". I looked for other similar posts but have (Hardware)