Internal Error with Redis

[adminsyn]

after following this one

ownCloud Documentation Overview

I end up following this thread.

ResolveTransactional file locking message in admin page

Yes! However, could you guide me how to switch to php7? I thought that Ubuntu 16.04 uses php7 You mean that I installed Redis on php 5? Forgive me for all these questions but i am newbie in system administrator..