Installing openemr from github

After git clone openemr to my local ubuntu box when I run local/openemr/setup.php? my browser shows HTTP ERROR 500.
I took a look of our Git for Dummies wiki page but I don see any update.
Please advice

hi @robertovasquez, please see GitHub - openemr/openemr: OpenEMR is the most popular open source electronic health records and medical practice management solution. ONC certified with international usage, OpenEMR's goal is a superior alternative to its proprietary counterparts.