This is likely due to one or some of the PPAs you have enabled. Please
use the tool ppa-purge from the ppa-purge package to remove the PPAs and
try the upgrade again.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1886071
Title:
Failed to calculate the system update Ubuntu 18.04.4 to 20.04
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