I recently installed Ubuntu 5.10 on my laptop and everything worked like a charm! Ubuntu detected all my hardware without any problem! Everything except my pcmcia WiFi card! It’s a Linksys WPC54G . After googling for it i came up with the following solution that worked for me! It took me like 5 minutes to set it up and have it up and running! I just downloaded the Drivers from Linksys website and used ndiswrapper-tools (Ubuntu’s port of Debian’s ndsiwrapper) to make it work with Ubuntu

ndiswrapper:
Some vendors do not release specifications of the hardware or provide a linux driver for their wireless network cards. This project implements Windows kernel API and NDIS (Network Driver Interface Specification) API within Linux kernel. A Windows driver for wireless network card is then linked to this implementation so that the driver runs natively, as though it is in Windows, without binary emulation.

After i extracted the zip file i loaded the .inf file (lsbcmnds.inf) using ndiswrapper tools
sudo ndiswrapper -i lsbcmnds.inf
Then i loaded the module on startup
sudo modprobe ndiswrapper
Finaly i appended “ndiwrapper” into /etc/modules
sudo pico /etc/modules and added ndiswrapper
And that’s it!
I activated the wlan0 interface and voila! WiFi on the spot! I just had to select the SID to connect!