HTTP ERROR 500 when trying to install magento 2.1.1 on ubuntu

Yesterday, i am confused, because usually when i was install magento, that’s no problem, but yesterday i found error when i try to install it. My browser say

“The localhost page isn’t working

localhost is currently unable to handle this request.

HTTP ERROR 500”

Hmmm…. i trying to search tutorial to fix it , several times looking for tutorials not fix the problem. So, i try to install magento on my windows and no problem. And finally, I look for another tutorial and i found this.

http://magento.stackexchange.com/questions/105821/magento-2-not-working-on-apache2-php7-and-ubuntu

Yeahh.. simple way, just increase /setup in behind. hehehehe :D