Remove useless dashboard widgets from the start screen

functions.php

/**
 * Remove useless dashboard widgets
 */
function remove_dashboard_widgets(){
  global $wp_meta_boxes;
	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_plugins']);
	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_recent_comments']);
	unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_primary']);
	unset($wp_meta_boxes['dashboard']['side']['core']['dashboard_secondary']);
	unset($wp_meta_boxes['dashboard']['normal']['core']['dashboard_incoming_links']);
}
add_action('wp_dashboard_setup', 'remove_dashboard_widgets');