Not sure if this is important but though I would add my experience.
I had the same issue using a desktop with 11.10, and a Tenda W54P wireless PCI 
card.
For unrelated reasons I removed it and started using a USB dongle (Edimax 
EW-7612UAn) and the problem went away.
With both of them I used the drivers which came with ubuntu so I would assume 
it is a problem with one of the wireless drivers. Unfortunately I have no idea 
how to check which driver was being used previously as I dont have the card 
anymore.

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https://bugs.launchpad.net/bugs/882817

Title:
  shutdown screen stuck after upgrade to Ubuntu 11.10

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