idroot published a tutorial about installing Fail2ban on Ubuntu 20.04 LTS.
How To Install Fail2ban on Ubuntu 20.04 LTS
In this tutorial, we will show you how to install Fail2ban on Ubuntu 20.04 LTS. For those of you who didn’t know, Fail2Ban is a utility that is used to detect and prevent brute force intrusion.
How To Install Fail2ban on Ubuntu 20.04 LTS