[Bug 1893659] [NEW] Can't upgrade from 18.04 to 20.04 with 'do-release-upgrade' tool

[Mathieu Mege]

Public bug reported:

During the process of upgrade, I gave a message which tell me that an
error occurred during the computation of the packet dependencies.

$ lsb_release -rd
Description:	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 5.3.0-53.47~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-53-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Mon Aug 31 16:13:32 2020
InstallationDate: Installed on 2020-03-09 (174 days ago)
InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-08-31 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2020-08-31T15:20:48.778677

** 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/1893659

Title:
  Can't upgrade from 18.04 to 20.04 with 'do-release-upgrade' tool

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

Bug description:
  During the process of upgrade, I gave a message which tell me that an
  error occurred during the computation of the packet dependencies.

  $ lsb_release -rd
  Description:	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 5.3.0-53.47~18.04.1-generic 5.3.18
  Uname: Linux 5.3.0-53-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.17
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Aug 31 16:13:32 2020
  InstallationDate: Installed on 2020-03-09 (174 days ago)
  InstallationMedia: Ubuntu 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-08-31 (0 days ago)
  mtime.conffile..etc.update-manager.release-upgrades: 2020-08-31T15:20:48.778677

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