title: How to get password for sudo
body: <p>I'm trying to use the command <code>sudo -i -u postgres</code> for PostgreSQL, and the Google Compute Engine VM is asking me for my password for my account (not root).</p>
  
  <p>As I never issued a password, and I always login to my server via SSH key, I'm not sure what the password is, how I can reset it, or where it can be found.</p>
  
  <p>Please tell me where I can get my password?</p>