[Bug 1924192] [NEW] Distribution upgrade (from 18.04 to 20.04) fails on "Calculating Upgrade" with no action-step suggestions other than filing a bug report.

[Lars Friend]

Public bug reported:

This is a fairly vanilla desktop workstation.  I've got a lot of -dev
packages installed, and some external repos which I had to disable first
(e.g openscad, kicad) but nothing particularly weird.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.42
ProcVersionSignature: Ubuntu 4.15.0-141.145-generic 4.15.18
Uname: Linux 4.15.0-141-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.23
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Wed Apr 14 17:37:40 2021
InstallationDate: Installed on 2015-03-09 (2228 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2021-04-15 (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/1924192

Title:
  Distribution upgrade (from 18.04 to 20.04) fails on "Calculating
  Upgrade" with no action-step suggestions other than filing a bug
  report.

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

Bug description:
  This is a fairly vanilla desktop workstation.  I've got a lot of -dev
  packages installed, and some external repos which I had to disable
  first (e.g openscad, kicad) but nothing particularly weird.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.42
  ProcVersionSignature: Ubuntu 4.15.0-141.145-generic 4.15.18
  Uname: Linux 4.15.0-141-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.23
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Wed Apr 14 17:37:40 2021
  InstallationDate: Installed on 2015-03-09 (2228 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to bionic on 2021-04-15 (0 days ago)

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