Bug#955393: popularity-contest: gpg: 5B1A07804DD558242CF5538215A07BA5233E3E85: skipped: unusable public key

[Thorsten Glaser <tg@mirbsd.de>]

Package: popularity-contest
Version: 1.70
Severity: normal

Just trying to trigger a run manually on this box before
shutting it down:

tg@leee:~ $ sudo cleanenv / /etc/cron.daily/popularity-contest
gpg: 5B1A07804DD558242CF5538215A07BA5233E3E85: skipped: unusable public key
gpg: /var/log/popularity-contest.new: encryption failed: unusable public key


The cleanenv part is benign, it just does
	cd /
	exec /usr/bin/env -i PATH=/bin:/usr/bin:/sbin:/usr/sbin HOME=/ "$@"

-- System Information:
Debian Release: bullseye/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 5.4.0-4-686-pae (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE=C (charmap=UTF-8)
Shell: /bin/sh linked to /bin/lksh
Init: sysvinit (via /sbin/init)

Versions of packages popularity-contest depends on:
ii  debconf [debconf-2.0]  1.5.73
ii  dpkg                   1.19.7

Versions of packages popularity-contest recommends:
ii  cron [cron-daemon]              3.0pl1-136
ii  gnupg                           2.2.20-1
ii  postfix [mail-transport-agent]  3.5.0-1

Versions of packages popularity-contest suggests:
ii  anacron   2.3-29
pn  tor       <none>
pn  torsocks  <none>

-- debconf information:
* popularity-contest/participate: true
  popularity-contest/submiturls: