Problem with visualization on Firefox

A friend of mine has been helping me with the installation on Ubuntu 16.04. We seemingly achieved to do all the coding in the Terminal, but by the time I go to the graphic part, everything I see is code in the same layout that the actual information should be shown. Has this happened to anyone before?
P.S. I am definitely not an expert programmer.

Apparently there was a problem with my apache2 installation. This helped me correct the issue: http://stackoverflow.com/questions/12142172/apache-shows-php-code-instead-of-executing
Greetings to future readers

Keesling, happy to hear that you issue is sorted! No coding should be needed to run Gibbon, but a bit of command line interface (CLI) experience goes a long way!