title: Vagrant up error (default: Box 'boxcutter/ubuntu1510' could not be found)
body: <p>Hello I'm a newbie who just set up the VM and vagrant on my windows 10.
  When I tried to <code>vagrant up</code> in command prompt, the following message was shown.</p>
  
  <p><a href="https://i.stack.imgur.com/8Rpg7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8Rpg7.png" alt="enter image description here"></a></p>
  
  <p>I don't know anything about Vagrant or Box, but I just want to start learning Ruby...
  would anybody help me please?</p>