In 16.04 e-Vent's service file exists at /lib/systemd/system/shorewall.service. If you run:
sudo systemctl enable /lib/systemd/system/shorewall.service
a symlink will be created in /etc/systemd/system/basic.target.wants/ and shorewall will start on boot.
In 16.04 e-Vent's service file exists at /lib/systemd/ system/ shorewall. service. If you run:
sudo systemctl enable /lib/systemd/ system/ shorewall. service
a symlink will be created in /etc/systemd/ system/ basic.target. wants/ and shorewall will start on boot.