title: nginx index.html does not update after modification
body: <p>Sorry for noob question, I suck at Ubuntu.</p>
  
  <p>I have just installed nginx in a Ubuntu server with:</p>
  
  <pre><code>sudo apt-get update
  sudo apt-get -y install nginx
  </code></pre>
  
  <p>It successfully built. I'm trying to change the index page, so I have modified my <code>/usr/share/nginx/html/index.html</code>, and then tried all of these:</p>
  
  <pre><code>sudo service nginx stop
  sudo service nginx start
  sudo service nginx restart
  </code></pre>
  
  <p>But when I refresh the root page on my browser it still shows the old page.   </p>
  
  <p>This is what the index.html looks like:<br>
  <a href="https://i.stack.imgur.com/xJZu4.png" rel="noreferrer"><img src="https://i.stack.imgur.com/xJZu4.png" alt="enter image description here"></a></p>
  
  <p>I have checked my <code>/etc/nginx/nginx.conf</code>, but don't find anything particular there.</p>
  
  <p>What could I be missing?</p>