package imagemagick-6-common 8:6.9.10.23+dfsg-2.1ubuntu11 failed to install/upgrade: conffile difference visualizer subprocess returned error exit status 127

[Corne Steenvoorden]

This happened during upgrade from 18.04 to 20.04. The upgrade would ask me if I wanted to keep the old file or install a new one. The default was to keep the old one so that is what I did. When rebooting after the install this error came up.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: imagemagick-6-common 8:6.9.10.23+dfsg-2.1ubuntu11
ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44
Uname: Linux 5.4.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.3
Architecture: amd64
CasperMD5CheckResult: skip
Date: Thu Jul 9 10:11:50 2020
Dependencies:

ErrorMessage: conffile difference visualizer subprocess returned error exit status 127
InstallationDate: Installed on 2019-06-10 (394 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64 (20190210)
PackageArchitecture: all
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: /usr/bin/python2.7, Python 2.7.18rc1, python-is-python2, 2.7.17-4
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2ubuntu0.1
SourcePackage: imagemagick
Title: package imagemagick-6-common 8:6.9.10.23+dfsg-2.1ubuntu11 failed to install/upgrade: conffile difference visualizer subprocess returned error exit status 127
UpgradeStatus: Upgraded to focal on 2020-07-09 (0 days ago)
mtime.conffile..etc.ImageMagick-6.policy.xml: 2020-06-18T13:04:17.495367