** Description changed:

+ [Impact]
+ During a release upgrade to Ubuntu 20.04 LTS some users are not able to view 
the differences made to a configuration file during the upgrade process. This 
creates a bad user experience and leads to extra crash reports.
+ 
+ [Test Case]
+ 1) Upgrade from a not usr-merged system (Ubuntu 16.04 LTS) to Ubuntu 18.04 LTS
+ 2) Install the smartmontools package
+ 3) Edit /etc/default/smartmontools (it's enough to just add a comment in 
there)
+ 4) Upgrade to Ubuntu 20.04 LTS (this requires do-release-upgrade -d as 
20.04.1 is not out yet so release upgrades are not enabled)
+ 
+ To test the fix in the version of less from focal-proposed some hackery
+ of the release upgrader code will be necessary as it disables proposed
+ during the upgrade process. After enabling -proposed for bionic you'll
+ want to run do-release-upgrade -d, then cancel the upgrade. After which
+ you can cd to /tmp/ubuntu-release-upgrader-$MKTMPDIR and edit
+ DistUpgradeController.py and the if statement around line 641 re
+ "Disable proposed on upgrade to a development release". Then run 'sudo
+ ./focal'.
+ 
+ [Regression Potential]
+ None, as we are just calling update-alternatives in the preinst of less.
+ 
+ 
  Issue occurred on upgrade from 19.10 to 20.04
  
- ProblemType: Package
- DistroRelease: Ubuntu 20.04
+ ProblemType: PackageDistroRelease: 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)
+ 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
+  dpkg 1.19.7ubuntu3
+  apt  2.0.2SourcePackage: 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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https://bugs.launchpad.net/bugs/1874953

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

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