[Bug 1870427] [NEW] package smartmontools 7.1-1build1 failed to install/upgrade: conffile difference visualizer subprocess returned error exit status 127

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During an upgrade from eoan to focal I got the following error:

 package:smartmontools:7.1-1build1
 Installing new version of config file /etc/init.d/smartmontools ...

 Configuration file '/etc/smartd.conf'
  ==> Modified (by you or by a script) since installation.
  ==> Package distributor has shipped an updated version.
    What would you like to do about it ?  Your options are:
     Y or I  : install the package maintainer's version
     N or O  : keep your currently-installed version
       D     : show the differences between the versions
       Z     : start a shell to examine the situation
  The default action is to keep your current version.
 *** smartd.conf (Y/I/N/O/D/Z) [default=N] ? d
 sh: 1: pager: not found
 diff: standard output: Broken pipe
 dpkg: error processing package smartmontools (--configure):
  conffile difference visualizer subprocess returned error exit status 127

ProblemType: Package
DistroRelease: Ubuntu 20.04
Package: smartmontools 7.1-1build1
Uname: Linux 5.6.2-050602-generic x86_64
ApportVersion: 2.20.11-0ubuntu22
Architecture: amd64
Date: Thu Apr  2 19:58:06 2020
ErrorMessage: conffile difference visualizer subprocess returned error exit status 127
Python3Details: /usr/bin/python3.8, Python 3.8.2, python3-minimal, 3.8.2-0ubuntu1
PythonDetails: /usr/bin/python3.8, Python 3.8.2, python-is-python3, 3.8.2-3
RelatedPackageVersions:
 dpkg 1.19.7ubuntu2
 apt  2.0.1
SourcePackage: smartmontools
Title: package smartmontools 7.1-1build1 failed to install/upgrade: conffile difference visualizer subprocess returned error exit status 127
UpgradeStatus: Upgraded to focal on 2020-04-02 (0 days ago)
mtime.conffile..etc.smartd.conf: 2019-06-28T19:35:09.428956

** Affects: dpkg (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-package focal
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package smartmontools 7.1-1build1 failed to install/upgrade: conffile difference visualizer subprocess returned error exit status 127
https://bugs.launchpad.net/bugs/1870427
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