Thank you, Brian. The new version of the release upgrader resolved the
problem. I am happily on 20.04 now.
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https://bugs.launchpad.net/bugs/1928734
Title:
Upgrade from 18.04 to 20.04
Public bug reported:
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
If none of this applies, then please report this bug using the command
'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If you want to
investigate this yourself the log