I follow this tutorial: [enter link description here](https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/)
To install mongodb on Ubuntu 16.04 amazon ec2.

But when i check if the service is ok, i found this:

[![enter image description here](https://i.stack.imgur.com/tnrwK.png)](https://i.stack.imgur.com/tnrwK.png) 

Why? How to solve?