There don't seem to be any native drivers available for this card in Ubuntu, so to get it to work one needs to use ndiswrapper which implements windows APIs in the Linux kernel, allowing windows drivers to be used.
Read it here
Unfortunately it isn't as simple as using the package manager to install ndiswrapper, as this doesn't install the kernel module properly/at all [my understanding of kernel modules isn't all it should be]. You'll need to download and compile ndiswrapper, but it doesn't compile under the out of the box Gutsy install and when you try to load the kernel module you get a fatal error. I found that to get round this, you need to update kernel headers.