Wifi not working ubuntu 11.10

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http://askubuntu.com – i am not able to get my wifi working consistently in ubuntu. At times when wifi is switched on in windows and I switch to ubuntu, wifi networks are recognized. But if i try and turn on wifi in ubuntu, there is no change. I get the message that the wireless is disabled by the hardware switch and indeed I see no blue light to indicate that the wifi is on. I looked up this post Wifi not working properly 11.10 ubuntu and tried the workaround. Still no good. Need help! (HowTos)