What you are looking for is not ntpd
which is not installed by default. It's an if-up.d
script which run time update whenever a network interface activated.
dconf watch /
shows nothing but inotifywait -m -r /etc/
will do.
/etc/network/if-up.d/ MOVED_FROM ntpdate
/etc/network/if-up.d/ MOVED_TO ntpdate.disabled
It belongs to ntpdate package.
$ dpkg -S /etc/network/if-up.d/ntpdate
ntpdate: /etc/network/if-up.d/ntpdate
So to disable time update, rename that file same as the control center does:
sudo mv /etc/network/if-up.d/ntpdate /etc/network/if-up.d/ntpdate.disabled
sudo /etc/init.d/ntp stop
doesn't work - see comments on my answer – TellMeWhy Oct 8 '15 at 15:41