title: The following packages have unmet dependencies: mongodb-org :
body: <p>I am trying to install Mongodb using the command <code>sudo apt-get install -y mongodb-org</code> on ubuntu 16.04 after it produces the following error:</p>
  
  <pre><code>Some packages could not be installed. This may mean that you have
  requested an impossible situation or if you are using the unstable
  distribution that some required packages have not yet been created
  or been moved out of Incoming.
  The following information may help to resolve the situation:
  
  The following packages have unmet dependencies:
   mongodb-org : Depends: mongodb-org-shell but it is not going to be installed
                 Depends: mongodb-org-server but it is not going to be installed
                 Depends: mongodb-org-mongos but it is not going to be installed
  E: Unable to correct problems, you have held broken packages.
  </code></pre>