[Bug 1875269] [NEW] unexpected error while upgrading from 18.04.34 to 20.04

[Mehrdad]

Public bug reported:

I wanted to upgrade from Ubuntu 18.04.04 to 20.04 using command line.
Executing the command ```sudo do-release-upgrade -d``` resulted in an
unexpected error:

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

This was caused by: 
* Upgrading to a pre-release version of Ubuntu 
This is most likely a transient problem, 
please try again later. 

What shall I do about it?

Thank you

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.3.0-46.38~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity:Unity7:ubuntu
Date: Sun Apr 26 19:42:13 2020
InstallationDate: Installed on 2018-11-14 (529 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-04-27 (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/1875269

Title:
  unexpected error while upgrading from 18.04.34 to 20.04

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

Bug description:
  I wanted to upgrade from Ubuntu 18.04.04 to 20.04 using command line.
  Executing the command ```sudo do-release-upgrade -d``` resulted in an
  unexpected error:

  Could not calculate the upgrade

  An unresolvable problem occurred while calculating the upgrade.

  This was caused by: 
  * Upgrading to a pre-release version of Ubuntu 
  This is most likely a transient problem, 
  please try again later. 

  What shall I do about it?

  Thank you

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 5.3.0-46.38~18.04.1-generic 5.3.18
  Uname: Linux 5.3.0-46-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Sun Apr 26 19:42:13 2020
  InstallationDate: Installed on 2018-11-14 (529 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-04-27 (0 days ago)

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