How to enable WordPress Automatic background updates

How to enable the automatic update of WordPress core, plugins, themes, and translations.

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Environment

WordPress 3.7+

Issue

Maintain up-to-date Website with WordPress Automatic background updates.

Resolution

Using filters allows for fine-tuned control of WordPress Automatic Updates.

Add the following filters in a must-use plugin — under wp-content/mu-plugins by default:

• wp-content/mu-plugins/update.php

<?php // mu-plugins/update.php
add_filter( 'allow_dev_auto_core_updates', '__return_false' );           // Enable nightlies (dev updates) 
add_filter( 'allow_major_auto_core_updates', '__return_true' );         // Enable major updates
add_filter( 'allow_minor_auto_core_updates', '__return_true' );         // Enable minor updates
add_filter( 'auto_update_plugin', '__return_true' );
add_filter( 'auto_update_theme', '__return_true' );
add_filter( 'auto_update_translation', '__return_true' );
add_filter( 'auto_core_update_send_email', '__return_true' );

Root Cause