sudo apt install python3-pyinotify python3-systemd 2to3
git clone https://github.com/fail2ban/fail2ban.git
cd fail2ban
./fail2ban-2to3
sudo python setup.py install --without-tests
sudo cp build/fail2ban.service /etc/systemd/system/fail2ban.service
sudo systemctl enable fail2ban
sudo service fail2ban start
sudo fail2ban-client status
sudo fail2ban-client version
sudo fail2ban-client --test
sudo fail2ban-client -h