title: Creating user in ubuntu from AWS
body: <p>Using AWS (Amazon Web Services) I have created an Ubuntu 16.10 instance and I am able to login using a pem file like this: 
  ssh -i key.pem ubuntu@52.16.73.14.54</p>
  
  <p>After I am logged, I can see that I am able to execute: 
  sudo su 
  (with no password), however the file /etc/sudoers does NOT contain any reference to the user current user: ubuntu.</p>
  
  <p>How can I create another user with exactly the same behavior (without touching the sudoers file) from terminal in a NON interactive way?</p>
  
  <p>I tried: 
  sudo useradd -m -c "adding a test user" -G sudo,adm -s /bin/bash testuser</p>
  
  <p>But after I become "testuser" if I invoke:
  sudo su
  I have to provide a password. Which is exactly the way I want to avoid.</p>