[Bug 1874953] Re: dpkg: conffile difference visualizer subprocess returned error exit status 127

[Paride Legovini]

The minimal change is probably moving

update-alternatives --quiet --remove pager /bin/less

from postinst to preinst. The pager alternative will fallback to 'more'
at least until the new alternative is set up. Strictly speaking it is
probably the most correct thing to do, as 'pager' is never left wrongly
configured.

However there are several packages calling `update-alternatives
--install` from preinst [1]. That's probably OK too.

[1] https://codesearch.debian.net/search?q=path%3Adebian%2Fpreinst
+update-alternatives&literal=1

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Title:
  dpkg: conffile difference visualizer subprocess returned error exit
  status 127

Status in dpkg package in Ubuntu:
  Triaged
Status in less package in Ubuntu:
  In Progress
Status in smartmontools package in Ubuntu:
  Invalid
Status in dpkg source package in Focal:
  New
Status in less source package in Focal:
  Triaged
Status in smartmontools source package in Focal:
  New
Status in dpkg source package in Groovy:
  Triaged
Status in less source package in Groovy:
  In Progress
Status in smartmontools source package in Groovy:
  Invalid
Status in dpkg package in Debian:
  New

Bug description:
  Issue occurred on upgrade from 19.10 to 20.04

  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: Fri Apr 24 21:33:08 2020
  ErrorMessage: conffile difference visualizer subprocess returned error exit status 127
  InstallationDate: Installed on 2011-06-18 (3233 days ago)
  InstallationMedia: Ubuntu-Server 11.04 "Natty Narwhal" - Release amd64 (20110426)
  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  2.0.2
  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 2020-04-25 (0 days ago)
  mtime.conffile..etc.default.smartmontools: 2017-12-08T19:12:02.064375
  mtime.conffile..etc.smartd.conf: 2017-12-08T20:27:28.727282

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