title: undefined function imagecreatefrompng() with PHP7.0
body: <p>I used to install GD:</p>
  
  <p>sudo apt-get install php7.0-gd</p>
  
  <p>and also</p>
  
  <p>sudo apt-get install php-gd</p>
  
  <p>but still not working!! </p>
  
  <p>Im using Ubuntu 16.04.3</p>