How to Set Up SSH Two Factor Authentication on Ubuntu 18.04, 18.10 Server

This tutorial will show you how to set up SSH two factor authentication on Ubuntu 18.04/18.10 server using the well-known Google Authenticator. It will greatly increase the security of your OpenSSH server.
How Two Factor Authentication Works
Normally, you only need to enter a password or use SSH...

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How to Set Up SSH Two Factor Authentication on Ubuntu 18.04, 18.10 Server