Hi, thank you for your report.
As you can see:
"This can be caused by:
* Upgrading to a pre-release version of Ubuntu"
I think it is because of some broken dependencies or some packages does not
build in Oneiric as for now, and should be fixed shortly.
** Changed in: update-manager (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/856987
Title:
Upgrade to Oneiric fails
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