This has something to do with one of the PPAs that you have enabled, I
suggest using ppa-purge to remove all of them.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1787862
Title:
error "could not calculate the upgrade" while upgrading Kubuntu 17.10
to 18.04
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