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]
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 20.04
InstallationDate: Installed on 2018-05-16 (706 days ago)
InstallationMedia: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
NonfreeKernelModules: nvidia_modeset nvidia
Package: ubuntu-release-upgrader (not installed)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.4.0-24.28-generic 5.4.30
Tags: focal dist-upgrade
Uname: Linux 5.4.0-24-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-04-17 (4 days ago)
UserGroups: adm bumblebee cdrom dip docker libvirt lpadmin plugdev sambashare sudo
VarLogDistupgradeXorgFixuplog:
INFO:root:/usr/bin/do-release-upgrade running
INFO:root:No xorg.conf, exiting
_MarkForUpload: True
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/alternativ