Same problem here, I've got a Realtek RTL8187SE adapter..
I'll give the best answer I've found so far, even though I haven't tried it out yet.. If anyone knows better, let me know.
"If your interface doesn't appear or ensure it is connected to your VM through the removable devices, if not, try to connect it via live cd (by burning the ISO to a cd and booting from that). Finally, check that your adapter is even compatible through google."
Although I didn't find a list that even included my adapter on google, I'm going to try partitioning my external hd in a few weeks to see if that solves the problem.
Also, if all else fails, find an adapter that you know is compatible for sure that is available as USB plugin and try again.



