Had that exact same problem on Ubuntu 15.10. The File /etc/apparmor.d/usr.sbin.ntpd contains the following line:
# samba4 ntp signing socket /{,var/}run/samba/ntp_signd/socket rw, But the line should be /var/lib/samba/ntp_signd/socket rw, -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/930266 Title: Add samba4 ntp signing socket to ntpd apparmor profile To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/930266/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs