/etc/apparmor/init/network-interface-security/usr.sbin.ntpd is in ntp 1:4.2.6.p5+dfsg-3ubuntu2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /etc/apparmor/init/network-interface-security/../../../apparmor.d/usr.sbin.ntpd