http://www.example.com/index.php/about
http://example.com/index.php/about

http://www.example.com/about
http://example.com/about

inanzzz@ubuntu:/etc/apache2/sites-enabled$ sudo nano 000-default.conf

<VirtualHost *:80>
    ServerAdmin webmaster@localhost
    DocumentRoot /var/www/html

    <Directory /var/www/html/>
            Options Indexes FollowSymLinks MultiViews
            # changed from None to FileInfo
            AllowOverride FileInfo
            Order allow,deny
            allow from all
    </Directory>

    ErrorLog ${APACHE_LOG_DIR}/error.log
    CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>

RewriteEngine On
RewriteRule ^index.php$ / [R=301,L]
RewriteRule ^(.*)/index.php$ /$1/ [R=301,L]

Options +FollowSymlinks -MultiViews

RewriteEngine on

RewriteCond %{HTTP_HOST} !^www. [NC]
RewriteCond %{REQUEST_URI} ^(.*/)index.html$ [NC]
RewriteRule . http://www.%{HTTP_HOST}%1 [R=301,NE,L]

RewriteCond %{HTTP_HOST} !^www. [NC]
RewriteRule . http://www.%{HTTP_HOST}%{REQUEST_URI} [NE,R=301,L]

RewriteCond %{REQUEST_URI} ^(.*/)index.php$ [NC]
RewriteRule . %1 [R=301,NE,L]

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*).php$ /$1 [L,R=301]

RewriteEngine On
RewriteCond %{REQUEST_URI} index.php
RewriteRule ^(.*)index.php$ /$1/ [R=301,L]