如何在Ubuntu上设置CodeIgniter ?

I'm having trouble making my CodeIgniter project work in Ubuntu since I've developed it on Windows. My main problem is that I don't even see any error or warning that can help me determine what the problem is. As you can see it's just a blank screen. The environment that I've declared in the index.php file is development and I've also enabled display_errors by setting it to On. I'm having trouble making my CodeIgniter projec