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i am not able to connect to the wi-fi in my area please help me out how to connect to the wi-fi from the starting. i have recently bought my new laptop DELL VOSTRO 2420. how to connect wi-fi to this???

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First, install the prerequisites by opening a terminal and pasting, one line at a time:

sudo apt-get install linux-headers$(uname -r | grep -Po "\-[a-z].*")
sudo apt-get install build-essential dkms

Please download the appropriate DEB file from Dropbox here:

32-bit/i386

64-bit/amd64

Open a terminal, and install it with sudo dpkg -i.

Hopefully it works!

Edit: 12.04 now has an updated bcmwl-kernel-source package that reportedly supports BCM43142.

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