title: Vagrant up - The box 'ubuntu/vivid64' could not be found
body: <p>On vagrant up keep getting this error:</p>
  
  <pre><code>$ vagrant up
  Bringing machine 'default' up with 'virtualbox' provider...
  ==&gt; default: Box 'ubuntu/vivid64' could not be found. Attempting to find and install...
      default: Box Provider: virtualbox
      default: Box Version: &gt;= 0
  The box 'ubuntu/vivid64' could not be found or
  could not be accessed in the remote catalog. If this is a private
  box on HashiCorp's Atlas, please verify you're logged in via
  `vagrant login`. Also, please double-check the name. The expanded
  URL and error message are shown below:
  
  URL: ["https://atlas.hashicorp.com/ubuntu/vivid64"]
  Error: The requested URL returned error: 404 Not Found
  </code></pre>
  
  <p>I suggest that something is wrong with url, but don't know how to solve it..</p>