Vagrant installation issue

I am trying to install Open edx Devstack on Ubuntu 16.04. I am asked to do below cmd:

vagrant box add {BOX-NAME} {BOX-FILE} 

that means

vagrant box add ginkgo-devstack-2017-07-14 /home/millionlights/vagrant-images_ginkgo-devstack-2017-07-14.box

but after this it shows:

The program 'vagrant' is currently not installed. You can install it by typing:
sudo apt install vagrant

And when I run sudo apt install vagrant it shows

vagrant is already the newest version (1:2.0.3)

Also when I do vagrant --version it shows:

The program 'vagrant' is currently not installed. You can install it by typing:
sudo apt install vagrant

This is contradictory behavior, I am confused if vagrant is installed or not ???

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