How can I stop the updates notifier box from appearing?

Question

note to future users who come across this question

this question has been tagged as a possible duplicate of

• How can I check if automatic updates are enabled?

That question is about the whole process of having the OS apt-get update and apt-get upgrade packages automatically - not the popup manager window.
However this question is a duplicate of this:

• How to disable the update manager popup?

It turns out the update manager popup cannot be managed through apt's configuration files, it acts as an independent daemon and needs to be managed separately.

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Every morning when I log into my install of Ubuntu 16.04.1 I get this:

I don't want this box to appear, as I would rather handle the updating process manually.

I have the following configuration:

file: /etc/apt/conf.d/10periodic

APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Download-Upgradeable-Packages "0";
APT::Periodic::AutocleanInterval "0";
// Try and turn off autoupating
APT::Periodic::Enable "0";

file: /etc/apt/conf.d/20auto-upgrades

APT::Periodic::Update-Package-Lists "0";
APT::Periodic::Unattended-Upgrade "0";

My attempt to discover what is responsible for firing the automatic update system

man apt.conf states:

PERIODIC AND ARCHIVES OPTIONS
APT::Periodic and APT::Archives groups of options configure behavior of
apt periodic updates, which is done by the /etc/cron.daily/apt script.
See the top of this script for the brief documentation of these options.

It looks like this has been replaced by /etc/cron.daily/apt-compat which mixes times abit so everyones Ubuntu doesn't try update at once then it calls:

/usr/lib/apt/apt.systemd.daily

/usr/lib/apt/apt.systemd.daily is a shell script that starts with a comment:

This file understands the following apt configuration variables:
Values here are the default.
Create /etc/apt/apt.conf.d/10periodic file to set your preference.

so following this advice I entered this

    // Try and turn off autoupating
    APT::Periodic::Enable "0";

into /etc/apt/apt.conf.d/10periodic as you can see from my config listing above. yet I am still getting the notification...

Possible solutions I can think of

• the comment // Try and turn off autoupating may be causing a parse error of the config file, causing apt to ignore the entire file?
• unlinking or commenting out /etc/cron.daily/apt-compat ?

How can I disable the update notifier box?