There are 3 steps to remove index.php
1.Make below changes in application/config.php file
$config['base_url'] = 'http://'.$_SERVER['SERVER_NAME'].'/Your Ci folder_name';
$config['index_page'] = '';
$config['uri_protocol'] = 'AUTO';
2.Make .htacces file in your root directory using below code
RewriteEngine on
RewriteCond $1 !^(index\.php|resources|robots\.txt)
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php/$1 [L,QSA]
3.Enable rewrite mode (if your rewrite mode is not enabled)
i. First, initiate it with the following command:
a2enmod rewrite
ii. Edit the file /etc/apache2/sites-enabled/000-default
change All AllowOverride None to AllowOverride All.
iii. Restart your server with the following command:
sudo /etc/init.d/apache2 restar