Public bug reported:

Upgrade from 18.04 to 20.04 fails. I have tried both the graphical
option and command line option.

Checking package manager
Reading package lists... Done    
Building dependency tree          
Reading state information... Done

Calculating the changes

Calculating the changes

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

Description:    Ubuntu 18.04.5 LTS
Release:        18.04

argj@argj-hpz8g4:/etc/apt/sources.list.d$ apt-cache policy pkgname
N: Unable to locate package pkgname

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1939722

Title:
  Upgrade from 18.04 to 20.04 aborts

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