The requested url / was not found on this server digital ocean

How to fix the requested url / was not found on this server digital ocean

a2enmod rewrite
sudo service apache2 restart

or

edit the file /etc/apache2/apache2.conf

Options Indexes FollowSymLinks
AllowOverride None
Require all granted

and change it to;

Options Indexes FollowSymLinks
AllowOverride All
Require all granted

then,

sudo service apache2 restart