Problem
Cron <root@xxxxx> /usr/bin/flock -n /var/run/shrinker.lock /opt/alt/python38/bin/python3 /opt/alt/modsec-sdbm-util/bin/shrinker.py > /dev/null
flock: failed to execute /opt/alt/python38/bin/python3: No such file or directory
Solution for Debian/Ubuntu:
#apt-get purge imunify360*
