[Bug 1881172] [NEW] Upgrading from ubuntu 18.04 to 20.04 fails with message "Upgrading to a pre-release version of Ubuntu"

[Theo Mazars]

Public bug reported:

Not able to upgrade my system to ubuntu 20.04.

Upgrade is aborting because of an unresolvable problem -> "Could not
calculate the upgrade"

I'm using Ubuntu 18.04.4 LTS

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Thu May 28 19:41:58 2020
InstallationDate: Installed on 2020-03-27 (61 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 2020-05-28 (0 days ago)

** 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/1881172

Title:
  Upgrading from ubuntu 18.04 to 20.04 fails with message "Upgrading to
  a pre-release version of Ubuntu"

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

Bug description:
  Not able to upgrade my system to ubuntu 20.04.

  Upgrade is aborting because of an unresolvable problem -> "Could not
  calculate the upgrade"

  I'm using Ubuntu 18.04.4 LTS

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
  Uname: Linux 5.4.0-28-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: GNOME
  Date: Thu May 28 19:41:58 2020
  InstallationDate: Installed on 2020-03-27 (61 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 2020-05-28 (0 days ago)

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