Yesterday I installed Ubuntu 9.10 on my HP Pavilion tx 2100 laptop (I am not sure the model series is correct, something like that). Everything went smooth except that it would not see WiFi wireless networks. It did, however, recognize my wireless EVDO card out of the box.
A quick search resulted in a quick fix. I just wanted to mention the proper links here.
This worked for me: http://ubuntuforums.org/showthread.php?t=1288865 I did not need the live CD because, as I mentioned before, I had an Internet connection, so the simple sudo apt-get install bcmwl-kernel-source worked fine. I had to reboot so the OS would recognize the driver, that's all.