Permission denied (publickey).
Whenerver I try to ssh into the droplet after creating a new user, and adding the latter with visudo. SSh connection keep throwing back " Permission denied (publickey)." error.
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Once you created user, you need to add SSH key to that user. This is explained in Step 4 of Initial Setup tutorial. As you have your SSH key already, jump straight to Copy the Public Key - Option 2: Manually Install the Key part. Once you're done, you should be to SSH with your new account.
When you start a new server, there are a few steps that you should take every time to add some basic security and give you a solid foundation. In this guide, we'll walk you through the basic steps necessary to hit the ground running with Ubuntu 16.04.