How to remove index.php from CodeIgniter URL in Ubuntu

CodeIgniter

In application/config/config.php
change:

$config['index_page']='index.php';

to

$config['index_page']='';

Create or modify .htaccess in project root with following content.

# Customized error messages.
ErrorDocument 404 /index.php
# Set the default handler.
DirectoryIndex index.php
# Various rewrite rules.

  RewriteEngine on
  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteRule ^(.*)$ index.php?/$1 [L,QSA]

Also allow overriding .htaccess in your apache

/etc/apache2/sites-available/default

and edit the file & change to

AllowOverrideAll

and Restart Apache

sudo /etc/init.d/apache2 reload

or

sudo service apache2 reload

or

sudo /etc/init.d/httpd reload