Public bug reported:

When trying to upgrade to 20.04 via

$ sudo do-release-upgrade -d'

the process aborts while calculating dependencies. The first error I can
spot in /var/log/dist-upgrade/main.log is

ERROR Dist-upgrade failed: 'Broken packages after upgrade: colord'

but I am unsure how to dig deeper to find out what exactly is going
wrong here. Does someone have a hint where to look next?

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.38
ProcVersionSignature: Ubuntu 4.15.0-115.116-generic 4.15.18
Uname: Linux 4.15.0-115-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.17
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Sat Aug 29 11:45:50 2020
InstallationDate: Installed on 2014-05-16 (2296 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to bionic on 2020-08-29 (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/1893510

Title:
  ubuntu upgrade from 18.04 to 20.04 fails due to dependency collision

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