[Bug 1887331] [NEW] mate upgrade 18.10 to 20.04 could not calculate the upgrade

[Michael]

Public bug reported:

Upgrading mate in virtualbox vm (vb version 6.1.10r138449), received "Could no calculate the upgrade"
Likely caused by indicates unofficial software packages not provided by ubuntu.
I removed the wireguard ppa, this cleared the error.

Then proceeded with upgrade again and received another error likely caused by:
Upgrading to a pre-release version of Ubuntu

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.3.0-62.56~18.04.1-generic 5.3.18
Uname: Linux 5.3.0-62-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Sun Jul 12 22:56:23 2020
InstallationDate: Installed on 2020-01-29 (165 days ago)
InstallationMedia: Ubuntu-MATE 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-07-13 (0 days ago)
VarLogDistupgradeTermlog:

** 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/1887331

Title:
  mate upgrade 18.10 to 20.04 could not calculate the upgrade

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

Bug description:
  Upgrading mate in virtualbox vm (vb version 6.1.10r138449), received "Could no calculate the upgrade"
  Likely caused by indicates unofficial software packages not provided by ubuntu.
  I removed the wireguard ppa, this cleared the error.

  Then proceeded with upgrade again and received another error likely caused by:
  Upgrading to a pre-release version of Ubuntu

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 5.3.0-62.56~18.04.1-generic 5.3.18
  Uname: Linux 5.3.0-62-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: MATE
  Date: Sun Jul 12 22:56:23 2020
  InstallationDate: Installed on 2020-01-29 (165 days ago)
  InstallationMedia: Ubuntu-MATE 18.04.3 LTS "Bionic Beaver" - Release amd64 (20190805)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-07-13 (0 days ago)
  VarLogDistupgradeTermlog:

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