Thank you for using Ubuntu and reporting a bug. Does adding the following to /etc/apparmor.d/usr.sbin.ntpd fix the problem for you:
network inet6 dgram,
(you'll need to run 'sudo apparmor_parser -r /etc/apparmor.d/usr.sbin.ntpd' after adjusting the profile)
Thank you for using Ubuntu and reporting a bug. Does adding the following to /etc/apparmor. d/usr.sbin. ntpd fix the problem for you:
network inet6 dgram,
(you'll need to run 'sudo apparmor_parser -r /etc/apparmor. d/usr.sbin. ntpd' after adjusting the profile)