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Ubuntu Server add new user

Add a new user to existing Ubuntu Server

Login with sudo-user, then:

      1.  sudo adduser <UserName>
      2. Enter password as stated in command line

Make user sudo-user

      1. sudo adduser <UserName> sudo
      2. To verify type id <UserName>. To the left under „user groups“ it should state „sudo„

Source: https://www.cyberciti.biz/faq/how-to-create-a-sudo-user-on-ubuntu-linux-server/

Allow user to login via ssh

      1. Open the ssh config file using vim:
        vim /etc/ssh/sshd_config
      2. Scroll to button until you find AllowUsers
      3. Add username, separate multiple usernames by space:
        AllowUsers user1 user2 user3
      4. Reload ssh:
        service sshd restart

Source: https://kifarunix.com/allow-deny-specific-users-to-login-via-ssh-on-ubuntu-18-04/