title: Root login Ubuntu VM on Azure
body: <p>Installed Ubuntu Server LTS 14.04 from Azure library on Azure VM.
  Logged in as standard "azureuser" created by Azure with my password.
  Changed root password:</p>
  
  <pre><code>sudo passwd root
  </code></pre>
  
  <p>If I try to login as "root": </p>
  
  <pre><code>Access denied
  </code></pre>
  
  <p>What do I miss?
  And yes, the password is correct.</p>