[Bug 1909025] [NEW] Distribution upgrader crashes with note: an unresolved problem occured while calculating the upgrade

[István Drimbe]

Public bug reported:

An unresolvable problem occurred while calculating the upgrade. (from
Ubuntu 18.04 LTS to Ubuntu 20.04 LTS)

 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 files in '/var/log/dist-upgrade' will
contain details about the upgrade. Specifically, look at 'main.log' and
'apt.log'.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.41
ProcVersionSignature: Ubuntu 4.15.0-128.131-generic 4.15.18
Uname: Linux 4.15.0-128-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.20
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Tue Dec 22 17:35:37 2020
InstallationDate: Installed on 2014-05-27 (2400 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-12-22 (0 days ago)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1909025

Title:
  Distribution upgrader crashes with note: an unresolved problem occured
  while calculating the upgrade

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

Bug description:
  An unresolvable problem occurred while calculating the upgrade. (from
  Ubuntu 18.04 LTS to Ubuntu 20.04 LTS)

   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 files in '/var/log/dist-
  upgrade' will contain details about the upgrade. Specifically, look at
  'main.log' and 'apt.log'.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.41
  ProcVersionSignature: Ubuntu 4.15.0-128.131-generic 4.15.18
  Uname: Linux 4.15.0-128-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.20
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Tue Dec 22 17:35:37 2020
  InstallationDate: Installed on 2014-05-27 (2400 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-12-22 (0 days ago)
  VarLogDistupgradeTermlog:

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