Step 1: Open a terminal window and download meteor installation package with following command:
curl | sh

If above curl command does not work, you need install curl first by running following command:
sudo apt-get install curl libcurl3 libcurl3-dev php5-curl

Step 2: Create a meteor application by running following command:

sudo meteor create your-app-name

Step 3: start meteor by running following command:
cd your-app-name

You will see prompt : App running at http://localhost:3000/

Congratulations, your meteor is installed and running successfully!

You can open an browser and type http://localhost:3000 and see your meteor website.