After i upgrade from ubuntu 12.04 to 12.10 my netbook failed to connect internet via wifi.i got a solution via ubuntu forum
Open Terminal in ubuntu 12.10,run following commands
sudo modprobe -r b43 ssb wl
sudo apt-get remove bcmwl-kernel-source
sudo apt-get install build-essential dkms linux-headers-generic
sudo apt-get install bcmwl-kernel-source
i got the solution from ubuntu forums
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