Hello Joe, 
                         I'm not sure which version you are talking
about.  I made the switch from 10 to 11 so I can't test the shut down
bug that I found in 10.  But, I have an educated guess that it was a
timer error.  Timers are set off when powering down so some tasks have a
chance to complete.  The timer end then finally triggers shutdown
signal.  That never came because the timer software did not come clean.
Hope this helps - Claude Caci

On Mon, 2012-03-12 at 13:59 +0000, Joseph Salisbury wrote:

> Would it be possible for you to test the latest upstream kernel?  Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v3.3 kernel[1] (Not a kernel in the daily directory).  Once you've
> tested the upstream kernel, please remove the 'needs-upstream-testing'
> tag(Only that one tag, please leave the other tags). This can be done by
> clicking on the yellow pencil icon next to the tag located at the bottom
> of the bug description and deleting the 'needs-upstream-testing' text.
> 
> If this bug is fixed in the mainline kernel, please add the following
> tag 'kernel-fixed-upstream'.
> 
> If the mainline kernel does not fix this bug, please add the tag:
> 'kernel-bug-exists-upstream'.
> 
> If you are unable to test the mainline kernel, for example it will not boot, 
> please add the tag: 'kernel-unable-to-test-upstream'.  
> Once testing of the upstream kernel is complete, please mark this bug as 
> "Confirmed".
> 
> 
> Thanks in advance.
> 
> [1] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.3-rc7-precise/
> 
> ** Changed in: linux (Ubuntu)
>    Importance: Undecided => Medium
> 
> ** Changed in: linux (Ubuntu)
>        Status: Confirmed => Incomplete
> 
> ** Tags added: needs-upstream-testing
>

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https://bugs.launchpad.net/bugs/949572

Title:
  From the computer icon in the control bar, "Shut Down" fails

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