[Bug 1917065] [NEW] upgrade from 18.04 to 20.04 fails with error "An unresolvable problem occurred while calculating the upgrade"

[Troy Collin]

Public bug reported:

Description:	Ubuntu 18.04.5 LTS
Release:	18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
ProcVersionSignature: Ubuntu 5.4.0-66.74~18.04.2-generic 5.4.86
Uname: Linux 5.4.0-66-generic x86_64
NonfreeKernelModules: talpa_vfshook talpa_pedconnector talpa_pedevice talpa_vcdevice talpa_core talpa_linux talpa_syscallhook nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Feb 26 11:22:42 2021
InstallationDate: Installed on 2020-01-28 (395 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-02-26 (0 days ago)

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


** Tags: amd64 apport-bug bionic dist-upgrade

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https://bugs.launchpad.net/bugs/1917065

Title:
  upgrade from 18.04 to 20.04 fails with error "An unresolvable problem
  occurred while calculating the upgrade"

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Description:	Ubuntu 18.04.5 LTS
  Release:	18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 5.4.0-66.74~18.04.2-generic 5.4.86
  Uname: Linux 5.4.0-66-generic x86_64
  NonfreeKernelModules: talpa_vfshook talpa_pedconnector talpa_pedevice talpa_vcdevice talpa_core talpa_linux talpa_syscallhook nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Feb 26 11:22:42 2021
  InstallationDate: Installed on 2020-01-28 (395 days ago)
  InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-02-26 (0 days ago)

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