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How do I install BCM43142 wireless drivers for Dell Vostro 3460/3560?

I just bought new Dell Vostro 3560 with Ubuntu 11.10 and when I upgareded it to 12.04 LTS I lost my wifi card. System doesnt see my wifi cards so im not able to install any drivers, etc.

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marked as duplicate by jokerdino, John S Gruber, Mitch, stephenmyall, Jorge Castro Aug 25 '12 at 12:56

This question was marked as an exact duplicate of an existing question.

Have you checked the wireless hardware switch? – Mitch Jul 2 '12 at 14:45
Welcome to Ask Ubuntu! We need more hardware information to help you, can you look at this question and then edit your question adding the information. – Jorge Castro Jul 8 '12 at 22:09
The same problem. WIFI doesn't work on 12.04, but worked on 11.10 that came preinstalled. I switched to Win7 because of it :( – Zelid Aug 12 '12 at 8:23

In terminal run

lspci |grep Network

If output is similar to this:

Network controller: Broadcom Corporatrion Device 4365 (rev 01)

or another Broadcom chipset 43xx series, follow this solution:

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