Here is a question I’ve been seeing pop up over the past few days:
My Broadcom bcm4306 Wireless card wont work in Ubuntu 8.04. How do I fix it?
The most common reason is simply because Ubuntu did not enable the restricted driver. If your Ubuntu 8.04 installation did not enable your Broadcom Corporation BCM4306 Wireless LAN Controller, here is how to enable it.
First, you need to make sure the b43-fwcutter package is installed.
sudo apt-get install b43-fwcutter
Next, navigate to System -> Administration -> Hardware Drivers
You should see your Broadcom 4306 device listed. Check the box to enable it.
Now your bcm43xx Broadcom Wireless card should be working in Ubuntu 8.04!