Welcome to LQ!
You didn't mention the model of your adapter, but I did some Googling and saw some information on Netgear's WG111 adpter. If perchance that is the model you are using, you might take a look at this thread
to see if it is any help. The ndiswrapper project is here
. If you need information on the project you may be able to find it on that site or by Googling for it. (My brief perusal of the ndiswrapper site left me uncertain what condition it was in.)
If you are using a model other than WG111, perhaps you could post the model number?
While searching, I also came across this page
. While the page doesn't contain a solution (possibly because the OP never responded back) it does contain the suggestion to run (with your adapter plugged in) the command:
to find the chipset your adapter uses. You might plug the chipset into a search engine along with the term "linux" or "ubuntu" and see if anything relevant comes up.