Thanks for your bugreport.
This sounds like a transient error in the archive (this sometimes
happens when some updates are already available, but other are still
being build and not yet published).
Does it work now? If so, I would like to mark it a wishlist bug to
improve the error message.
** Changed in: update-manager (Ubuntu)
Status: Unconfirmed => Needs Info
** Bug 63657 has been marked a duplicate of this bug
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unresolvable problem occurred while calculating the upgrade
https://launchpad.net/bugs/63659
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