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How to create a new sudo user on Ubuntu Linux server

I am a new Ubuntu Linux 16.04.xx LTS server user. How do I create a new sudo user on my server? How do I add a new user as sudoer file using the command line option on Ubuntu?
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Ubuntu Linux: Add a User To Group

How do I add a user to group under Ubuntu Linux operating system using command line options?
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Linux /bin/false VS /sbin/nologin: Politely Refuse a Login

How do I deny access to user account? Do I need to use /bin/false or /sbin/nologin to refuse a login?
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