[SOLVED]Ubuntu: How to disable automatic updates on Ubuntu

9:00 04/05/2015
###############
On Ubuntu, automatic updates are managed by a package called unattended-upgrades which is installed by default. This package downloads and installs security updates automatically. Optionally, it can also auto-upgrade packages available from other configured APT sources (such as "updates", "proposed" "backports"). If you want to disable automatic updates on Ubuntu, there are several ways to do it.

Method One
##########
One way to turn off automatic upgrade is to reconfigure unattended-upgrades. To do so, edit its configuration at /etc/apt/apt.conf.d/50unattended-upgrades

You can selectively disable individual APT sources to auto-update, by commenting out corresponding sources in "Unattended-Upgrade::Allowed-Origins":

Unattended-Upgrade::Allowed-Origins {
        "${distro_id}:${distro_codename}-security";
//      "${distro_id}:${distro_codename}-updates";
//      "${distro_id}:${distro_codename}-proposed";
//      "${distro_id}:${distro_codename}-backports";
};

You can also selectively disable auto-update on a package level, by adding package names to "Unattended-Upgrade::Package-Blacklist":

Unattended-Upgrade::Package-Blacklist {
//      "vim";
//      "libc6";
};
#
#
#
Method Two
##########
If you can disable auto-update system-wide, you can add the following info in /etc/apt/apt.conf.d/10periodic.
$ sudo -e /etc/apt/apt.conf.d/10periodic

APT::Periodic::Unattended-Upgrade "0";

The above setup will disable unattended-upgrade altogether.
#
#
#
Method Three
############
If you are using Ubuntu Desktop, you can also turn off auto-update via Ubuntu Software Center. Open Ubuntu Software Center, and go to Edit --> Software Sources. Choose "Never" for "Automatically check for updates".


Source: http://ask.xmodulo.com/disable-automatic-updates-ubuntu.html