[Bug 1873423] Re: package zsh-common 5.8-3ubuntu1 failed to install/upgrade: conffile difference visualiser subprocess returned error exit status 127

[Axel Beckert]

It's not your .zshrc (which would be in your home directory) but the
system's /etc/zsh/zshrc which has been deleted and tried to compare.

This issue seems though unrelated to the deletion of /etc/zsh/zshrc,
with which at coped properly:

Configuration file '/etc/zsh/zshrc'
 ==> Deleted (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.

It seems not a zsh issue at all but a general release upgrade issue
which just happened to happen while handling conffiles of the package
zsh-common:

*** zshrc (Y/I/N/O/D/Z) [default=N] ? d
sh: 1: pager: not found
diff: standard output: Broken pipe

So for some reason, /usr/bin/pager (or /bin/pager or so) was not
available during the release upgrade. /usr/bin/pager is usually
/etc/alternatives/pager. Unfortunately, I have not really an idea
against which package this could have caused. Reassigning to ubuntu-
release-upgrader-core for now.

** Package changed: zsh (Ubuntu) => ubuntu-release-upgrader (Ubuntu)

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https://bugs.launchpad.net/bugs/1873423

Title:
  package zsh-common 5.8-3ubuntu1 failed to install/upgrade: conffile
  difference visualiser subprocess returned error exit status 127

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  Occurred while doing do-release-upgrade -d
  I had previously deleted my .zshrc and made the mistake of trying to do a compare when the installer prompted me on what I wanted to do with the new file

  ProblemType: Package
  DistroRelease: Ubuntu 20.04
  Package: zsh-common 5.8-3ubuntu1
  ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
  Uname: Linux 5.4.0-24-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  ApportVersion: 2.20.11-0ubuntu27
  Architecture: amd64
  CasperMD5CheckResult: skip
  Date: Fri Apr 17 08:36:42 2020
  Dependencies:
   
  ErrorMessage: conffile difference visualiser subprocess returned error exit status 127
  InstallationDate: Installed on 2018-05-16 (701 days ago)
  InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
  PackageArchitecture: all
  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: zsh
  Title: package zsh-common 5.8-3ubuntu1 failed to install/upgrade: conffile difference visualiser subprocess returned error exit status 127
  UpgradeStatus: Upgraded to focal on 2020-04-17 (0 days ago)
  modified.conffile..etc.zsh.newuser.zshrc.recommended: [deleted]
  modified.conffile..etc.zsh.zlogin: [deleted]
  modified.conffile..etc.zsh.zlogout: [deleted]
  modified.conffile..etc.zsh.zprofile: [deleted]
  modified.conffile..etc.zsh.zshenv: [deleted]

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