title: Force no prompt in apt-get upgrade or apt-get dist-upgrade
body: <p>I'm using AWS EC2 14.04 LTS and I'm trying to run command 
  <code>apt-get -y upgrade</code> or <code>apt-get -y dist-upgrade</code>, however, I always get prompt like this:</p>
  
  <p><img src="https://i.stack.imgur.com/Wnp0e.png" alt="enter image description here">
  I tried following commands and none of them work and I still get above prompt:</p>
  
  <p><code>apt-get update &amp;&amp; apt-get -y -o Dpkg::Options::="--force-confmiss" -o Dpkg::Options::="--force-confdef" -o Dpkg::Options::="--force-confnew" dist-upgrade</code></p>
  
  <p><code>apt-get update &amp;&amp; apt-get -o Dpkg::Options::='--force-confold' --force-yes -fuy dist-upgrade</code></p>
  
  <p>I have been been googling for solutions but could not find that actually works. Anyone has any thought?</p>
  
  <p>Thanks</p>