The upgrade fails to calculate due to the vim PPA which you have enabled
as it provides a version of vim greater than the one in the official
Ubuntu archive. Please use the tool ppa-purge from the package ppa-purge
to remove that PPA and try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1787013
Title:
Could not calculate the upgrade An unresolvable problem occurred
while calculating the upgrade. from 16.4 to 18.4 update
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