Is Linksys WUSB54GSC compatible?

[colter.vest]

How do I get my Linksys WUSB54GSC to work with Backtrack 4 final?

[0m3gasw1tch]

You'll need to be more specific. Do you mean, does it work under BT4 generally, or is it supported with packet-injection capabilities for tools such as Aircrack-ng under BT4?

Regardless of which of the above you are interested in, why don't you start by telling us what you've tried so far?