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

omniorb-nameserver is installed in your system.

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

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

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

omniorb-nameserver package basic information: