After installing 8.04, I never had a chance to test wireless until now. I was always plugged the ethernet in under my desk. I notice one time at home that Fn-F2 was not enabling my wireless radio. I checked hardware drivers in System->Administration->Hardware Drivers. My Broadcom B43 wireless driver was in use but no enabled. When I clicked enable, it would install drivers and prompt for a restart. After a restart, it was again unchecked as enabled.
I looked on the ubuntu forums and google to see if anyone else was having problems. I found this tutorial but the last step was causing me trouble so I decided to modify it for you.
First, you can find out what Wireless Card you have by typing
Broadcom Corporation BCM4309 802.11a/b/g (rev 03)
I like to keep everything I download to install in a properly named “Installs” folder
So lets begin. This will allow us to build the driver
sudo apt-get install build-essential
Now make the Installs directory and download b43-fwcutter which will allow us to extract firmware for Broadcom driver
sudo mkdir ~/Installs
Now we are going to extract and compile
tar xjf b43-fwcutter-011.tar.bz2
Now we are ready for the firmware and to properly install it.
tar xjf broadcom-wl-184.108.40.206.tar.bz2
sudo b43-fwcutter -w /lib/firmware broadcom-wl-220.127.116.11/kmod/wl_apsta.o
The output should look something like this:
This file is recognised as:
ID : FW11
filename : wl_apsta.o
version : 351.126
MD5 : 9207bc565c2fc9fa1591f6c7911d3fc0
After that, restart the computer and your radio should be working. Make sure, that in the BIOS, the wireless device is set to on/fn-f2. You can load BIOS by tapping F2 while the computer is turning on.