Enable wifi firmware on Ubuntu 12.04

Solution 1:

I own a late 2009 MacBook running Ubuntu 12.10. I went to this website and it instructed me to use the following command line:

sudo apt-get install firmware-b43-installer

After the installer finished, I did not see my wireless network work. I completely shut down and then restarted and when Ubuntu had finished booting, there was a prompt saying that wireless networks were available to connect to. I hope this helps.

Solution 2:

Connect an ethernet cable, and wait for a prompt to install the wireless driver. If nothing happens after a minute, search for Additional Drivers in the Dash. Anything there? If not, you'll need to post some info about the wireless hardware. For example, the output of lspci from a terminal ctrl-alt-t would be a start.

Solution 3:

For Broadcom Corporation BCM4331 802.11a/b/g/n [you can test it by : lspci -nn | grep 0280]

Run in terminal :

sudo apt-get install linux-firmware-nonfree

sudo modprobe b43

dmesg |grep -e b43 -e bcma

it worked like a magic for me..

taken from:::: http://ubuntuforums.org/showthread.php?t=2011756