title: Failed to start mongod.service: Unit mongod.service not found
body: <p>I follow all the steps mention in MongoDB installation <a href="https://docs.mongodb.com/getting-started/shell/tutorial/install-mongodb-on-ubuntu/" rel="noreferrer">documents</a> for <code>Ubuntu 16.04</code>.</p>
  
  <p><strong>Steps 1:</strong> </p>
  
  <pre><code>sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 2930ADAE8CAF5059EE73BB4B58712A2291FA4AD5
  </code></pre>
  
  <p><strong>Steps 2:</strong> </p>
  
  <pre><code>echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu xenial/mongodb-org/3.6 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-3.6.list
  </code></pre>
  
  <p><strong>Steps 3:</strong> </p>
  
  <pre><code>sudo apt-get update
  </code></pre>
  
  <p><strong>Steps 4:</strong> </p>
  
  <pre><code>sudo apt-get install -y mongodb-org
  </code></pre>
  
  <p><strong>Steps 5:</strong> </p>
  
  <pre><code>sudo service mongod start
  </code></pre>
  
  <p>when I started MongoDB got an error as: </p>
  
  <blockquote>
    <p><strong>Failed to start mongod.service: Unit mongod.service not found.</strong></p>
  </blockquote>