E: unable to locate package firmware-b43-installer when i

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http://askubuntu.com – i am using acer aspire-5002wlmi laptop and installed dual os windows-xp and ubuntu 12.04. wifi is well working in xp but when i start ubuntu i will get below error every start, [ 95.514855] b43-phy0 ERROR: You must go to http://wireless.kernel.org/en/users/Drivers/b43#devicefirmware and download the correct firmware for this driver version. Please carefully read all the instruction on this website. then i followed the instructions from the below link file:///C:/Documents%20and%20Settings/MGL/Desktop/how%20to%20install%20u... (HowTos)