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I have executed the following commands:

sudo apt-get install firmware-b43-installer
sudo apt-get remove bcmwl-kernel-source

When I run lspci, I found "broadcom" as "bcm43142 chip".

I downloaded wireless-bcm43142-dkms_6.20.55.19-1_amd64.deb and attempted to install it with:

sudo dpkg -i wire*.deb

I am getting an error that b43 module does not exist in /proc/modules etc ...

What should I do?

share|improve this question
You have a BCM43142, which is unsupported by b43. Please remove it. Possible duplicate of Ubuntu 12.10 Dell/Broadcom BCM43142 driver install trouble – mikewhatever Apr 9 '13 at 10:51
That's not really a significant error. The driver installation is trying to unload b43 yet can't find it in /proc/modules. In other words, it wants to unload a module (b43) that wasn't loaded in the first place. Please proceed with the next steps. – chili555 Apr 9 '13 at 12:20

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