[Bug 1888535] [NEW] upgrade to 20.04 fails with can't install ubuntu-mate-core message

[Nick Bunyan]

Public bug reported:

I have been trying to update for 3 or 4 days, have removed all the
launchpad repositories, purged everything I can think of anb the upgrade
just fails...

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
Uname: Linux 5.4.0-42-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
CrashDB: ubuntu
Date: Wed Jul 22 17:09:16 2020
InstallationDate: Installed on 2019-07-17 (370 days ago)
InstallationMedia: Ubuntu-MATE 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-07-22 (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/1888535

Title:
  upgrade to 20.04 fails with can't install ubuntu-mate-core message

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

Bug description:
  I have been trying to update for 3 or 4 days, have removed all the
  launchpad repositories, purged everything I can think of anb the
  upgrade just fails...

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 5.4.0-42.46~18.04.1-generic 5.4.44
  Uname: Linux 5.4.0-42-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.15
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Jul 22 17:09:16 2020
  InstallationDate: Installed on 2019-07-17 (370 days ago)
  InstallationMedia: Ubuntu-MATE 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-07-22 (0 days ago)
  VarLogDistupgradeTermlog:

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