I'm now using Ubuntu Studio 13.04, I haven't tried the device out yet
on that version. If I recall, I didn't need to use any specific
driver, I think it used the ALSA USB audio & midi drivers
automagically. You have to do a little bit of config in Ardour, to
make sure you use the correct protocol. I don't think it works in
Ardour2 or MixBus, though, just Ardour3.