This problem only occurs if the package "fwknop-apparmor-profile" is installed as well, which is creating the apparmor profile for fwknopd in /etc/apparmor.d/usr.sbin.fwknopd.
This problem only occurs if the package "fwknop- apparmor- profile" is installed as well, which is creating the apparmor profile for fwknopd in /etc/apparmor. d/usr.sbin. fwknopd.