Hmm, the pager is called from dpkg to show the diff in your case.
This didn't change and dpkg doesn't do anything magic.
I can only assume that you might have the "pager" itself setup in an odd way.
Due to a bug or intentional - I don't know.
Could you report back the output of:
$ update-alternatives --display pager
That most likely should look like:
root@f2:~# 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
If that is broken then I could see how the above error could happen.
Finally if that is not a local setup issue, then still it would be more
likely in dpkg and or less (as the common and default pager - both are
auto-installed and I see them updated in your log). I'll re-assign the
bug tasks accordingly.
** Package changed: smartmontools (Ubuntu) => dpkg (Ubuntu)
** Changed in: dpkg (Ubuntu)
Status: New => Incomplete
** Also affects: less (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1870427
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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