You need to add the Suricata repository so you can install it. Below are the commands:
echo "deb http://ppa.launchpad.net/oisf/suricata-stable/ubuntu $(lsb_release -sc) main" | sudo tee -a /etc/apt/sources.list
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys D7F87B2966EB736F
sudo apt update
After that, you should be able to install the module from Zentyal GUI.
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