fail2ban installation problem

Get the .deb file for debian stretch from here, then install it with:

sudo dpkg -i fail2ban*.deb

You’ll then need to fix the dependencies with:

sudo apt-get -f install

Next, there’s an extra dependency you’ll need, python3-systemd, so go ahead and install that:

sudo apt-get install python3-systemd

Finally, edit your /etc/fail2ban/jail.conf using your preferred editor telling it your preferred backend is systemd.

#backend = auto
backend = systemd

Last, but not least, start and enable fail2ban.

systemctl enable fail2ban
systemctl start fail2ban
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