It still would be nice to know what the version number of your card is, as requested. If you look at the link that I provided, on the back of the unit sticker, the model number is listed, as well as the version number. This will be helpful. But if Ubuntu saw the card, the next question is...is the wireless router that you are using a secured connection? Most likely it is (most ISP providers that give you a router have preset values to make it secure).
In Windows, the WUSB54G software guides you in setting up the connection for the router name (ESSID) and the passphrase (password) used to establish a connection to the router from the wireless card, in your case, the WUSB54G.
Of course, since you are using Linux, which the manufacturer does not provide direct support for, you need to know these values to set up in the network connection in Ubuntu manually. If this is the case. you will not connect to the wireless router without these values being set. The setup CD also has the proper drivers for the card/unit and installs them during the installation in Windows. In Linux, we have to make sure that the proper Linux drivers are included.
As each version of Ubuntu/Kubuntu comes out, wireless support generally gets better, which is why I asked what version of Kubuntu that you had. The newer the version of Kubuntu, the better support out of the box.
This assumes that Ubuntu did have the proper Linux drivers installed for your card, hence, the question about the version number that tells us which chipset is being used.
To give a good example, see
here.