[Bug 1878116] [NEW] upgrade failed: could not calculate the upgrade (from fresh new/fully patched 18.04 LTS install)

[Daniel LaSalle]

Public bug reported:

Installed 18.04.4 LTS 2 weeks ago on a box I had left dormant since
then.

1.
sudo apt update && sudo apt upgrade -y
= OK

2.
sudo update-manager -d
[...]
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.
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'.

tried a 2nd time as suggested, same error.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
Uname: Linux 5.3.0-51-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Mon May 11 20:05:57 2020
InstallationDate: Installed on 2020-05-05 (6 days ago)
InstallationMedia: Ubuntu-MATE 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-05-12 (0 days ago)
VarLogDistupgradeTermlog:

** 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/1878116

Title:
  upgrade failed: could not calculate the upgrade (from fresh new/fully
  patched 18.04 LTS install)

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

Bug description:
  Installed 18.04.4 LTS 2 weeks ago on a box I had left dormant since
  then.

  1.
  sudo apt update && sudo apt upgrade -y
  = OK

  2.
  sudo update-manager -d
  [...]
  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.
  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'.

  tried a 2nd time as suggested, same error.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 5.3.0-51.44~18.04.2-generic 5.3.18
  Uname: Linux 5.3.0-51-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Mon May 11 20:05:57 2020
  InstallationDate: Installed on 2020-05-05 (6 days ago)
  InstallationMedia: Ubuntu-MATE 18.04.4 LTS "Bionic Beaver" - Release amd64 (20200203.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-05-12 (0 days ago)
  VarLogDistupgradeTermlog:

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