Ben Collins has backported the sky2 driver from 2.6.16.13. It will be in the next kernel upload. it should fix this bug.
Please test when it is available and let us know.
** Changed in: linux-source-2.6.15 (Ubuntu)
Status: Unconfirmed => Fix Committed
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Network card stops working (sky2)
https://launchpad.net/bugs/41634