Probably because you somehow lost the linux-386 package that ensures that linux-restricted-modules is also upgraded.
sudo apt-get install linux-386
And you wont have this problem anymore.
** Changed in: linux-source-2.6.15 (Ubuntu)
Status: Unconfirmed => Rejected
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acx firmware not added to libs after kernel auto-update
https://launchpad.net/bugs/51674
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