title: Memcached - "No Memcached servers added" after upgrading to ubuntu 16.04
body: <p><strong>Does upgrading from ubuntu 14.04 to 16.04 affect multi-server memcached?</strong></p>
  
  <p>I have a Laravel 5.1 application which utilizes <code>memcached</code> to manage sessions across multiple servers, specifically two web servers and a database server.</p>
  
  <p>After upgrading the OS on each server from ubuntu 14.04 to 16.04 and installing the latest version of mariadb (10.1.*), our laravel application now returns the following error:</p>
  
  <blockquote>
    <p>[RuntimeException]
    No Memcached servers added.</p>
  </blockquote>
  
  <p>My config files have not changed and neither have the ip addresses of any of the servers. Debugging laravel's <code>MemcachedConnector.php</code>shows the server details being passed to the <code>Memcached</code> class but the output of <code>Memcached::getVersion()</code> returns <code>false</code>.</p>
  
  <p>I am at a loss as to why this has suddenly stopped working, any assitance would be appreciated.</p>