[Bug 1877859] [NEW] Release upgrade 18.4->20.4 fails

[Garry]

Public bug reported:

After update/upgrade to all most current packages under 18.04, rebooted,
then tried "do-release-upgrade"

root at dck:~# lsb_release  -rd
Description:    Ubuntu 18.04.4 LTS
Release:        18.04

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.37
ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18
Uname: Linux 4.15.0-99-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.14
Architecture: amd64
CrashDB: ubuntu
Date: Sun May 10 14:10:04 2020
InstallationDate: Installed on 2016-07-17 (1393 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-05-10 (0 days ago)

** 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/1877859

Title:
  Release upgrade 18.4->20.4 fails

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

Bug description:
  After update/upgrade to all most current packages under 18.04,
  rebooted, then tried "do-release-upgrade"

  root at dck:~# lsb_release  -rd
  Description:    Ubuntu 18.04.4 LTS
  Release:        18.04

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.37
  ProcVersionSignature: Ubuntu 4.15.0-99.100-generic 4.15.18
  Uname: Linux 4.15.0-99-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.14
  Architecture: amd64
  CrashDB: ubuntu
  Date: Sun May 10 14:10:04 2020
  InstallationDate: Installed on 2016-07-17 (1393 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2020-05-10 (0 days ago)

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