E: Unable to locate package mongodb-org

I am trying to download mongodb and I am following the steps on this [link](https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/#install-the-mongodb-packages). But when I get to the step: sudo apt-get install -y mongodb-org I get the following error: Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package mongodb-org //This is the error Why is this occurring and is there a work around?