$ sudo apt-get update
$ sudo apt-get install omniorb-idl 

omniorb-idl is installed in your system.

Make ensure the omniorb-idl package were installed using the commands given below,

$ sudo dpkg-query -l | grep omniorb-idl *

You will get with omniorb-idl package name, version, architecture and description in a table

omniorb-idl package basic information: