I'm still getting the same error in the setting.php
PHP Fatal error: Call to undefined method mysqli_stmt::get_result() in /var/www/openfaucet/public/include/classes/setting.class.php on line 16
I'm wondering if there needs to be some values in the DB or it's returning no values for tcertain tables. Would you be able to provide a dump of your test DB so I can import those values and test with them?
That error is specifically caused by not installing php5-mysqlnd and php5-curl. Try reinstalling them and updating.
The specifics being that get_result() is a mysqlnd function and if you haven't installed mysqlnd properly it will not be able to be called, resulting in a undefined method. It has nothing to do with the DB in general.