1. Boot the live DVD. Open "menu > all > additional drivers". Assuming your network card shows up, select activate.
2. When it throws an error, open the log file it points to (/var/log/jockey.log in my case). FInd the url of the driver it attempted to download (in my case http://archive.ubuntu.com/ubuntu/pool/r ... _amd64.deb
3. Boot your normal operating system, download the driver.
4. Boot the live DVD, Navigate to the directory where the driver was saved, and open a terminal.
5. enter "sudo dpkg -i bcmwl-kernel-source_220.127.116.11+bdcom-0ubuntu6.1_amd64.deb" (replacing the driver name with the driver you downloaded).
6. Open "menu > all > additional drivers", select activate. When it is finished it will tell you to restart. Disregard this.
7. Go back to the terminal and enter "sudo modprobe -r wl" then enter "sudo modprobe wl". Wait a few seconds.
8. Click on the taskbar networking icon and hopefully select a wireless network to connect to.