[Bug 1899425] [NEW] Upgrade from 18.04 to 20.04 aborted

[Dieter Dobratz]

Public bug reported:

The upgrade stops with:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

My system:
Ubuntu 18.04.5 LTS
Release:        18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
Uname: Linux 4.15.0-118-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Mon Oct 12 07:55:33 2020
InstallationDate: Installed on 2018-05-30 (865 days ago)
InstallationMedia:
 
PackageArchitecture: all
ProcEnviron:
 LANG=en_US.UTF-8
 TERM=screen-256color
 SHELL=/usr/bin/zsh
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-10-12 (0 days ago)
VarLogDistupgradeTermlog:

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


** Tags: amd64 apport-bug bionic dist-upgrade third-party-packages wayland-session

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https://bugs.launchpad.net/bugs/1899425

Title:
  Upgrade from 18.04 to 20.04 aborted

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

Bug description:
  The upgrade stops with:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  My system:
  Ubuntu 18.04.5 LTS
  Release:        18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.38
  ProcVersionSignature: Ubuntu 4.15.0-118.119-generic 4.15.18
  Uname: Linux 4.15.0-118-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Mon Oct 12 07:55:33 2020
  InstallationDate: Installed on 2018-05-30 (865 days ago)
  InstallationMedia:
   
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   TERM=screen-256color
   SHELL=/usr/bin/zsh
   XDG_RUNTIME_DIR=<set>
   PATH=(custom, no user)
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-10-12 (0 days ago)
  VarLogDistupgradeTermlog:

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