Hi,
I ran into another very similar bug report.
But OTOH I can not reproduce the issue.

Now what makes me suspicious are two things:
1. the recent fix was a backport about reading /etc/mtab
   So it would be great if you could share your /etc/mtab

2. both reports appear "asian" to me (I beg your pardon for not being able to 
recognize the countries)
   That said it might depend on certain characters in either mtab or in the 
system in general.
   I've seen issues with my locale being non en-US :-)
   So if you could report the output of
   $ locale
   I'd want to try with yours to recreate the issue

It would be great to get the info requested above.
Furthermore we should run your postinst as-is verbosely to check what exactly 
is failing.
This is a bit tricky but avoids issues due to the failed upgrade being rerolled.
$ apt download sysstat
$ dpkg-deb -x sysstat_11.2.0-1ubuntu0.2_amd64.deb sysstat
$ dpkg-deb -e sysstat_11.2.0-1ubuntu0.2_amd64.deb sysstat/DEBIAN
$ sed -i 's/set -e/set -ex/' sysstat/DEBIAN/post
$ dpkg-deb -b sysstat sysstat_verbose_11.2.0-1ubuntu0.2_amd64.deb
$ sudo dpkg -i sysstat_verbose_11.2.0-1ubuntu0.2_amd64.deb

Please provide the full output of the latter, that should lead us closer
to the issue.

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https://bugs.launchpad.net/bugs/1740721

Title:
  package sysstat 11.2.0-1ubuntu0.2 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 10

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