Perhaps this will help someone out there.
I was using Jaunty fine on my laptop (Dell e1705) with wireless working. I installed 9.10 beta and could not get it to work. In jaunty I was using the Broadcom Wireless driver that showed up in System > Administration > Hardware drivers.
When I installed 9.10 as a fresh install from the live cd, it would list only the Broadcom Wireless driver. I kept choosing "Activate" and entering my password, but it would never activate. Having no network connectivity, I was unable get any updates.
However this worked for me:
1) Open Synaptic Pacakage Manager
2) Ensure 9.10 LiveCd is in CD drive
3) Settings > Repositories > Ubuntu Software
4) Check the installable from cd and close
6) Search for "bcmwl-kernel-source"
7) Mark for installation
8) Install it
9) Reboot computer
That worked for me. It was activated Hardware Drivers now. Also, after doing this (I think because dkms installed with it) now the graphics drivers appeared in the Hardware Drivers scan, which hadn't before.
Basically, installing bcmwl-kernel-source was the key to success for me. Handily, it is on the livecd.