Hi, It seems the file /etc/logrotate.d/fail2ban gets left behind after removing fail2ban. This causes cron to generate errors as fail2ban-client does not exist. Regards Wouter
That the file is left behind by a remove is not a bug in itself, because only a purge would delete it. But the logrotate configuration is missing this check in the postrotate section: test -x /usr/bin/fail2ban-client || exit 0