I'm the script maintainer for this page. It contains a graphical installer (Python-based) for detection and installation of the appropriate drivers. If you're looking for Linux drivers for the following Broadcom Wireless chipsets:
Then you've come to the right place. You'll need the python-gtk2 package for Debian-based systems (such as Ubuntu). Chances are, if you've updated your system packages since you installed your OS, you already have it.

Packages marked with an asterisk (*) are supported by the bcm43xx kernel module and firmware. More information about the firmware can be found here. Other chipsets should use the Windows driver and ndiswrapper.
Recently, I've been dedicating a lot of my time in an attempt to get wireless chipsets to play nicely with Linux in general and Ubuntu in particular. I've come to the following realizations:
  1. Disabling WEP encryption does very little to help if your devices is detected but you can't connect to your access point. Restarting your router is more likely to solve the problem.
  2. Many people are convinced that when Windows updates their wireless drivers, their WiFi stops working in Ubuntu. If the firmware is modified by the upgrade, this could be the case. Users have solved this problem by rolling back their Windows XP or Vista drivers. If you dual boot and your WiFi suddenly stops working, it's probably a good idea to try rolling back your wireless driver. The firmware may be more immune to this hazard. I'm not making any claims either way on this issue; I'm simply relying on what other people have said.
  3. Feisty Fawn has serious issues with wireless connectivity. While other distros have their issues, many of them have better support for WiFi (in general) than Ubuntu does. If you simply can't get it working, try PCLinuxOS or Sabayon or some other distro.
  4. There is no "easy fix" for people whose WiFi device is detected but won't connect. I've looked through hundreds of pages today. A fresh reinstall might help; running Linux only might help; using a different OS might help. Sometimes it's just a matter of time until it seems to magically work out of nowhere.
faxservice.org