Did you try using ppa-purge as instructed?
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1820547
Title:
An unresolvable problem occurred while calculating the upgrade. This
was likely caused by: * Unofficial software packages not provided by
Ubuntu Please use the tool 'ppa-purge' from the ppa-purge package to
remove software from a Launchpad PPA and try the upgrade again.
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