Diabolikal has written a small tutorial on how to get ndiswrapper working on Kubuntu.
You have finally bitten the bullet. Kubuntu Linux is installed on that computer of yours. Unfortunatly, you can't use it to surf the web. It's wireless care isn't natively supported by Linux. Not to worry, this guide will teach you the basics.
Once you've installed Kubuntu on that shiny new laptop of yours, you'll want to be able to connect to your wireless network.
Read the rest here