Ťhese problome check lsit:

1, apache, vhost config: 

    <Directory /var/www/html>

            Options FollowSymLinks MultiViews

            AllowOverride All

            Require all granted

    </Directory>

2,enable mod_rewrite.

  $sudo a2enmod rewrite

3, check the docroot,find   .htaccess

   .htaccess

4, check the Files and folders permissions .