This is likely because of the kubuntu-backports PPA which you have
enabled and installed packages from. Please use the tool 'ppa-purge'
from the package 'ppa-purge' to remove the kubuntu-backports PPA and try
the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1787383
Title:
Cant update Kubuntu 16.04 to 18.04 update crashes displaying "could
not calculate the update"
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