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
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