package smartmontools 7.1-1build1 failed to install/upgrade: »Conffile-Unterschied-Darsteller«-Unterprozess gab den Fehlerwert 127 zurück

Upgrade from 19.10 to 20.04. The issue occured when trying to view the differences from the local configuration file to the one included in the updated package.

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: smartmontools 7.1-1build1
ProcVersionSignature: Ubuntu 5.3.0-46.38-generic 5.3.18
Uname: Linux 5.3.0-46-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
Date: Sat Apr 25 13:24:35 2020
ErrorMessage: »Conffile-Unterschied-Darsteller«-Unterprozess gab den Fehlerwert 127 zurück
InstallationDate: Installed on 2016-06-28 (1396 days ago)
InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu2
PythonDetails: N/A
RelatedPackageVersions:
 dpkg 1.19.7ubuntu3
 apt 2.0.2
SourcePackage: smartmontools
Title: package smartmontools 7.1-1build1 failed to install/upgrade: »Conffile-Unterschied-Darsteller«-Unterprozess gab den Fehlerwert 127 zurück
UpgradeStatus: Upgraded to focal on 2020-04-25 (0 days ago)
mtime.conffile..etc.smartd.conf: 2019-12-29T23:06:15.722393