It seems that you only disabled / removed the PPA's from your apt
sources, because the packages from them are still installed the upgrade
was not able to be calculated. You'll need to reenable the PPAs and use
the tool ppa-purge to remove the packages provided by the PPAs and
disable them.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1899859

Title:
  Could not calculate upgrade to Ubuntu 20 due to failure to remove
  python-minimal

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