Hey i know there are a few posts regarding this topic and i have scoured them all!
I cannot not enable the display_errors setting in php no matter what i do!!!
Please try:
grep "display_errors" /etc/php5/apache2/php.ini
Just to check how many time it appears.
Try error_reporting = E_ALL. Also, are you sure that you are editing the correct php.ini?
error_reporting = E_ALL