In /etc/apache2/apache2.conf:
    ...
    <Directory /var/www/>
            Options Indexes FollowSymLinks
            AllowOverride All
            Require all granted
    </Directory>

    ...
    AccessFileName .htaccess
    ...


    In /etc/apache2/sites-available/000-default.conf:

    <VirtualHost *:80>
    ...
    	DocumentRoot /var/www/html
    ...
    </VirtualHost>