In order to enable mod_rewrite on your server, you can type the following command in the terminal:
sudo a2enmod rewrite
Restart apache2 after
sudo /etc/init.d/apache2 restart
sudo service apache2 restart
or as per new unified System Control Way
sudo systemctl restart apache2
Edit .htaccess File
Then, if you’d like to update .htaccess, you can use the following instructions:
If .htaccess file is placed in DocumentRoot, then it will redirect all traffic to an index.php file in the DocumentRoot unless the file exists.
So, let’s say you have the following directory structure and http/www/ is the DocumentRoot
Any file that exists in httpdocs will be served to the requester using the .htaccess shown above, however, everything else will be redirected to http/www/index.php. Your application files in includes/app will not be accessible.
If none of the above works, then try editing /etc/apache2/sites-enabled/000-default and any other similar file in the directory:
Lets me know in the comments below if this solution worked for you.