[Bug 2002159] [NEW] do-release-upgrade from 18.04 to 20.04 fails with "An unresolvable problem occurred while calculating the upgrade."

Fri Jan 6 15:17:59 UTC 2023

Public bug reported:

I disabled all third-party package sources, uninstalled all packages
from ppa's or third party repositories (I think), purged all deleted
packages, tried to find obvious reasons for the failure in the logs. The
upgrade still fails.

lsb_release -rd
Description:    Ubuntu 18.04.6 LTS
Release:        18.04

apt-cache policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
  Installed: 1:18.04.45
  Candidate: 1:18.04.45
  Version table:
 *** 1:18.04.45 500
        500 http://fr.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        500 http://fr.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
        100 /var/lib/dpkg/status
     1:18.04.17 500
        500 http://fr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
        500 http://fr.archive.ubuntu.com/ubuntu bionic/main i386 Packages

Expected the upgrade to proceed (it did so on 4 or 5 other machines I
maintain).

Instead, the upgrade failed with the following message:
Reading cache

Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Hit http://fr.archive.ubuntu.com/ubuntu bionic InRelease
Get:1 http://fr.archive.ubuntu.com/ubuntu bionic-updates InRelease [88,7 kB]
Get:2 http://fr.archive.ubuntu.com/ubuntu bionic-backports InRelease [83,3 kB]
Hit http://security.ubuntu.com/ubuntu bionic-security InRelease
Fetched 172 kB in 0s (0 B/s)
Reading package lists... Done
Building dependency tree
Reading state information... Done

Checking for installed snaps

Calculating snap size requirements

Updating repository information
Hit http://fr.archive.ubuntu.com/ubuntu focal InRelease
Hit http://security.ubuntu.com/ubuntu focal-security InRelease
Hit http://fr.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit http://fr.archive.ubuntu.com/ubuntu focal-backports InRelease
Fetched 0 B in 0s (0 B/s)

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.

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'.

Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree
Reading state information... Done
=== Command detached from window (Fri Jan  6 16:11:23 2023) ===

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.45
ProcVersionSignature: Ubuntu 5.4.0-136.153~18.04.1-generic 5.4.218
Uname: Linux 5.4.0-136-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.28
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Fri Jan  6 16:02:22 2023
InstallationDate: Installed on 2018-11-23 (1504 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2023-01-06 (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/2002159

Title:
  do-release-upgrade from 18.04 to 20.04 fails with "An unresolvable
  problem occurred while calculating the upgrade."

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

Bug description:
  I disabled all third-party package sources, uninstalled all packages
  from ppa's or third party repositories (I think), purged all deleted
  packages, tried to find obvious reasons for the failure in the logs.
  The upgrade still fails.

  lsb_release -rd
  Description:    Ubuntu 18.04.6 LTS
  Release:        18.04

  apt-cache policy ubuntu-release-upgrader-core
  ubuntu-release-upgrader-core:
    Installed: 1:18.04.45
    Candidate: 1:18.04.45
    Version table:
   *** 1:18.04.45 500
          500 http://fr.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
          500 http://fr.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages
          100 /var/lib/dpkg/status
       1:18.04.17 500
          500 http://fr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
          500 http://fr.archive.ubuntu.com/ubuntu bionic/main i386 Packages

  Expected the upgrade to proceed (it did so on 4 or 5 other machines I
  maintain).

  Instead, the upgrade failed with the following message:
  Reading cache

  Checking package manager
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  Hit http://fr.archive.ubuntu.com/ubuntu bionic InRelease
  Get:1 http://fr.archive.ubuntu.com/ubuntu bionic-updates InRelease [88,7 kB]
  Get:2 http://fr.archive.ubuntu.com/ubuntu bionic-backports InRelease [83,3 kB]
  Hit http://security.ubuntu.com/ubuntu bionic-security InRelease
  Fetched 172 kB in 0s (0 B/s)
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done

  Checking for installed snaps

  Calculating snap size requirements

  Updating repository information
  Hit http://fr.archive.ubuntu.com/ubuntu focal InRelease
  Hit http://security.ubuntu.com/ubuntu focal-security InRelease
  Hit http://fr.archive.ubuntu.com/ubuntu focal-updates InRelease
  Hit http://fr.archive.ubuntu.com/ubuntu focal-backports InRelease
  Fetched 0 B in 0s (0 B/s)

  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.

  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'.

  Restoring original system state

  Aborting
  Reading package lists... Done
  Building dependency tree
  Reading state information... Done
  === Command detached from window (Fri Jan  6 16:11:23 2023) ===

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.45
  ProcVersionSignature: Ubuntu 5.4.0-136.153~18.04.1-generic 5.4.218
  Uname: Linux 5.4.0-136-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.28
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Fri Jan  6 16:02:22 2023
  InstallationDate: Installed on 2018-11-23 (1504 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2023-01-06 (0 days ago)

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