This really looks like an environment issue:
Setting up smartmontools (7.1-1build1) ...
Configuration file '/etc/default/smartmontools'
==> 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.
*** smartmontools (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
Due to missing /bin/pager:
(c)rafaeldtinoco@devel:~$ which pager
(c)rafaeldtinoco@devel:~$ ls -lah /bin/pager
lrwxrwxrwx 1 root root 23 Apr 24 21:39 /bin/pager -> /etc/alternatives/pager
(c)rafaeldtinoco@devel:~$ ls -lah /etc/alternatives/pager
lrwxrwxrwx 1 root root 13 Apr 24 21:39 /etc/alternatives/pager -> /usr/bin/less
Try checking your system for pager:
(c)rafaeldtinoco@devel:~$ sudo update-alternatives --query pager
Name: pager
Link: /usr/bin/pager
Slaves:
pager.1.gz /usr/share/man/man1/pager.1.gz
Status: auto
Best: /usr/bin/less
Value: /usr/bin/less
Alternative: /bin/more
Priority: 50
Slaves:
pager.1.gz /usr/share/man/man1/more.1.gz
Alternative: /usr/bin/less
Priority: 77
Slaves:
pager.1.gz /usr/share/man/man1/less.1.gz
and fixing it!
** Changed in: smartmontools (Ubuntu)
Status: New => Invalid
** Changed in: smartmontools (Ubuntu)
Status: Invalid => Triaged
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Server, which is subscribed to smartmontools in Ubuntu.
https://bugs.launchpad.net/bugs/1874953
Title:
package smartmontools 7.1-1build1 failed to install/upgrade: conffile
difference visualizer subprocess returned error exit status 127
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https://bugs.launchpad.net/ubuntu/+source/dpkg/+bug/1874953/+subscriptions
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