I just installed vagalume on my xubuntu box and i put in my user details in the configuration dialog but however, if i wanna play a station i always get a dialog box saying: "Invalid radio URL. Either this radio doesn't exist or it is only available for Last.fm subscribers" why is that? :o
Are you a Last.fm subscriber? You need to pay your Last.fm account in order to listen to their radios (unless you're from some of a few lucky countries). Where are you from, and what Vagalume version are you using?
xubuntu