title: SSH connection in Amazon lightsail
body: <p>I want to make an SSH connection from my own terminal, not from the browser-based command line interface Amazon provides.  How do I know what username and host to use in my SSH command?  So far, I'm unable to connect via SSH.  I believe I am using the key correctly, but I am getting "permission denied (publickey)".</p>
  
  <p>I have set 400 permissions for the private key file.</p>
  
  <p>Can I use the public IP for the host?  Is the username "ubuntu"?  Something else?</p>