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I installed Ubuntu 12.10 on my Dell E6400, everything is working fine, except my wifi.

The switch on the laptop is on but still Ubuntu does not recognize my wireless adapter.

I ran the lspci | grep Network command and it shows this:

Broadcom Corporation BCM4322 802.11a/b/g/n Wireless
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If there is a way to connect to the Internet, you can install the following packages in order to use wireless connections.

Open the Software Center and search&find&install these packages:



or you can install these packages with a terminal command(Short cut:Ctrl+Alt+T):

sudo apt-get install b43-fwcutter firmware-b43-installer

If your pc haven't a another internet connection, you can download driver packages from the following urls.

Please, be careful of packages architecture(The packages architecture you will choose must be same as your Ubuntu architecture.)

After this operation reboot your system and connect a wireless network.

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On my Dell Latitude E6400, running

sudo apt-get install bcmwl-kernel-source
sudo reboot

as proposed by an article on resolved the problem for me.

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That Ubuntu version is quite old. Update your Ubuntu version or install it clean and in the additional drivers tab you may find the driver you are missing. The latest Ubuntu version is Ubuntu 15.04.

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