Fix Missing Wireless Drivers on Ubuntu 12.04 , 13.10 BCM43xx Laptop

Your  Laptop’s Wifi not working in Ubuntu ? Here we have solution for BCM43xx Laptops ,

To check your model number

lspci | grep Wireless

Sample Result

0c:00.0 Network controller: Broadcom Corporation BCM4311 802.11a/b/g/n Wireless LAN Controller [14e4:432b] 

Here BCM4311 is ur model

How to FIX 

Get Internet  Via LAN cable or some where and run following command on terminal.

sudo apt-get remove --purge bcmwl-kernel-source
sudo apt-get install linux-firmware-nonfree
sudo modprobe b43

Restart your Laptop