I think you need to install the linux-restricted-modules package to get the drivers you need for that wireless adapter. Can you try that and see if you're able to use your card again?
** Changed in: Ubuntu
Sourcepackagename: None => linux-restricted-modules-2.6.15
Status: Unconfirmed => Needs Info
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firmware_class module seems to be missing
https://launchpad.net/bugs/46895
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