[Bug 2009861] [NEW] do-release-upgrade fails when upgrading to 22.04 "An unresolvable problem occurred"

[Luca Hermes]

Public bug reported:

I'm trying to upgrade my system from Ubuntu version 20.04 to 22.04 via
`do-release-upgrade`. The command fails with "An unresolvable problem
occurred while calculating the upgrade."

I did some research and found that external software sources may be the
issue, but I can't figure out which ones are causing the issue for me.
Any help is greatly appreciated.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: ubuntu-release-upgrader-core 1:20.04.40
ProcVersionSignature: Ubuntu 5.4.0-144.161-generic 5.4.229
Uname: Linux 5.4.0-144-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.25
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: Unity:Unity7:ubuntu
Date: Thu Mar  9 16:37:02 2023
InstallationDate: Installed on 2017-06-11 (2096 days ago)
InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to focal on 2023-03-09 (0 days ago)

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


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

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https://bugs.launchpad.net/bugs/2009861

Title:
  do-release-upgrade fails when upgrading to 22.04 "An unresolvable
  problem occurred"

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

Bug description:
  I'm trying to upgrade my system from Ubuntu version 20.04 to 22.04 via
  `do-release-upgrade`. The command fails with "An unresolvable problem
  occurred while calculating the upgrade."

  I did some research and found that external software sources may be
  the issue, but I can't figure out which ones are causing the issue for
  me. Any help is greatly appreciated.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: ubuntu-release-upgrader-core 1:20.04.40
  ProcVersionSignature: Ubuntu 5.4.0-144.161-generic 5.4.229
  Uname: Linux 5.4.0-144-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27.25
  Architecture: amd64
  CasperMD5CheckResult: skip
  CrashDB: ubuntu
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Thu Mar  9 16:37:02 2023
  InstallationDate: Installed on 2017-06-11 (2096 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to focal on 2023-03-09 (0 days ago)

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