title: How come I have this simple error in Selenium?
body: <p>I'm on AWS micro instance. There is no GUI. I SSH'ed into it.</p>
  
  <pre><code>pip install selenium
  sudo apt-get install firefox
  </code></pre>
  
  <p>Then, I do this in the python shell:</p>
  
  <pre><code>&gt;&gt;&gt; from selenium.webdriver.firefox.webdriver import WebDriver
  &gt;&gt;&gt; driver = WebDriver()
  Error: cannot open display: :0
  </code></pre>
  
  <p>How do I make this error go away? </p>