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

[Laurent Bonnaud]

Here it is on my system:

$ update-alternatives  --display pager
pager - auto mode
  link best version is /usr/bin/less
  link currently points to /usr/bin/less
  link pager is /usr/bin/pager
  slave pager.1.gz is /usr/share/man/man1/pager.1.gz
/bin/more - priority 50
  slave pager.1.gz: /usr/share/man/man1/more.1.gz
/usr/bin/less - priority 77
  slave pager.1.gz: /usr/share/man/man1/less.1.gz
/usr/bin/w3m - priority 25
  slave pager.1.gz: /usr/share/man/man1/w3m.1.gz

However this output is for my system in its current state, that has been
fixed by finishing the eoan -> focal upgrade.  The alternative was
probably transiently broken during the upgrade.

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Title:
  package smartmontools 7.1-1build1 failed to install/upgrade: conffile
  difference visualizer subprocess returned error exit status 127

Status in dpkg package in Ubuntu:
  Incomplete
Status in less package in Ubuntu:
  New

Bug description:
  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

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