get rid of index.php

Ok this is sound like a simple as it documents in CI.  I tested run on a project that is migrated to
Ubuntu 16.04.02 and the ci is under directory like var/www/myproject

I made all changes as neccessary per document to .htaccess and it drives me nut as I still cant
get rid of index.php within url such as http://myproject.com/showsomething
instead it requires http://myproject.com/index.php/showsomething!

I am not sure if the Ubuntu 16.04.02 is varied with the config somewhere.  I scratched my head
do almost all as I can try.

All other projects running on Ubuntu 14.04 are fine with htaccess I set up which is same as per doc suggestion

Anyone has any ideas?

Thanks