How to Install and Configure Fail2ban on Ubuntu Server 16.04

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Have you ever logged into your server and seen a message like this?

Last failed login: Fri Dec 28 11:37:02 MST 2018 from 192.168.0.102 on ssh:notty
There were 942 failed login attempts since the last successful login.
Last login: Mon Dec 24 13:35:57 2018 from 192.168.0.101

What happened here?
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