I've bought some stuff from linuxemporium (a laptop and a wireless usb stick like yours) in the past. I found them very helpful and easy to deal with. Have you tried giving them a ring? Obviously not today as it's a Bank Holiday!
0121 313 3857
It does say on their website...
This card uses the RT2571 chipset and works "out of the box" with Ubuntu 8.04 Hardy Heron.
...so they should provide you with help if it doesn't
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