On a fresh install of nod32 antivirus 4.0.81.0 on Ubuntu 16.04 LTS, I first set Apparmor to "complain" mode for all profiles and then went through the instructions in the ESET KB article 3723 to create an eset.service file under /lib/systemd/system and start service using systemctl:
hxxp://support.eset.com/kb3723/?locale=en_US
However, now I'm seeing multiple version update messages from esets_gui, and syslog is filled with messages from esets_gui, esets_daemon, systemd, and others:
warning: Cannot read from socket: Resource temporarily unavailable
error: Cannot get setup from dae