codeigniter code not working in ubantu operting system

I was working on a Windows system till few days ago.

I made a website in code-igniter framework.

Few days back I shifted from Windows to Ubuntu.

Now my default controller is loading, but as I access any other function in any controller it shows The requested URL was not found on this server.

The project which was running on the Windows system is down in Ubuntu.

Have no idea what to look for, as I am new to Ubuntu.

.htacess file

<IfModule mod_rewrite.c>
 RewriteEngine on
 RewriteCond $1 !^(index\.php|resources|robots\.txt)
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteRule ^(.*)$ index.php/$1 [L,QSA] 
</IfModule>

config.php

$config['base_url'] = '';

$config['index_page'] = '';

$config['uri_protocol'] = 'AUTO';

$config['url_suffix'] = '';

$config['language'] = 'english';

$config['charset'] = 'UTF-8';

$config['enable_hooks'] = FALSE;

$config['subclass_prefix'] = 'MY_';

$config['permitted_uri_chars'] = 'a-z 0-9~%.:_-';

$config['allow_get_array'] = TRUE;

$config['enable_query_strings'] = FALSE;

$config['controller_trigger'] = 'c';

$config['function_trigger'] = 'm';

$config['directory_trigger'] = 'd';

$config['log_threshold'] = 4;

$config['log_path'] = '';

$config['log_date_format'] = 'Y-m-d H:i:s';

$config['cache_path'] = '';

$config['encryption_key'] = 'samfd4556df4522488';

$config['sess_cookie_name'] = 'ci_session';

$config['sess_expiration'] = 7200;

$config['sess_expire_on_close'] = FALSE;

$config['sess_encrypt_cookie'] = FALSE;

$config['sess_use_database'] = FALSE;

$config['sess_table_name'] = 'ci_sessions';

$config['sess_match_ip'] = FALSE;

$config['sess_match_useragent'] = TRUE;

$config['sess_time_to_update'] = 300;

$config['cookie_prefix'] = "";

$config['cookie_domain'] = "";

$config['cookie_path'] = "/";

$config['cookie_secure'] = FALSE;

$config['global_xss_filtering'] = FALSE;

$config['csrf_protection'] = FALSE;

$config['csrf_token_name'] = 'csrf_test_name';

$config['csrf_cookie_name'] = 'csrf_cookie_name';

$config['csrf_expire'] = 7200;

$config['compress_output'] = FALSE;

$config['time_reference'] = 'local';

$config['rewrite_short_tags'] = FALSE;

$config['proxy_ips'] = '';