Bug#966119: popularity-contest: Unable to find runuser due to missing /sbin/ in PATH?

[Petter Reinholdtsen <pere@hungry.com>]

Package: popularity-contest
Version: 1.67
Severity: important

After enabling email on my laptop for the first time in many years, I
discovered this message from the cron subsystem:

  From: root@mylaptop (Cron Daemon)
  Subject: Cron <root@mylaptop>    test -x /etc/cron.daily/popularity-contest && /etc/cron.daily/popularity-contest --crond
  To: root@mylaptop
  Date: Thu, 23 Jul 2020 04:50:01 +0200

  /etc/cron.daily/popularity-contest: 109:
    /etc/cron.daily/popularity-contest: runuser: not found

The laptop installation has survived many upgrades, so the problem might
have bee introduced a long time ago.  This seem to be the same problem
reported in <URL: https://bugs.debian.org/709892 >, which was believed
to be solved then.

Here are some pieces of information that might be relevant:

root@minerva:~# ls -l /etc/cron*/popu*
-rwxr-xr-x 1 root root 4571 mai   20  2018 /etc/cron.daily/popularity-contest
-rw-r--r-- 1 root root  124 juni  22  2015 /etc/cron.d/popularity-contest
root@minerva:~# cat /etc/cron.d/popularity-contest 
SHELL=/bin/sh
50 4 * * *   root    test -x /etc/cron.daily/popularity-contest && /etc/cron.daily/popularity-contest --crond
root@minerva:~# dpkg -l '*cron*'
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name           Version            Architecture Description
+++-==============-==================-============-=======================================
ii  anacron        2.3-28             amd64        cron-like program that doesn't go by ti
ii  cron           3.0pl1-134+deb10u1 amd64        process scheduling daemon
-- 
Happy hacking
Petter Reinholdtsen