Thanks for your bugreport.
Please attach the files in /var/log/dist-upgrade to this bugreport. The
error reads like you have run the server upgrade (do-release-upgrade) on
a desktop system. If you run do-release-upgrade on a desktop system,
please run it as "do-release-upgrade -m desktop"
Thanks Michael
** Changed in: update-manager (Ubuntu)
Status: New => Incomplete
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A unresolvable problem occurred while calculating the upgrade.
https://bugs.launchpad.net/bugs/222048
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