AllowOveride All causes assetts and Admin Urls to 404

The step you’re missing is to change the mod flag like so:

sudo a2enmod rewrite

Also you’ll need to change the .htaccess; refer to this Stack Overflow post

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)