just to be sure I'm checking with systemctl [systemd] & system V [service]
sudo systemctl status fr24feed
● fr24feed.service - LSB: Flightradar24 Decoder & Feeder
Loaded: loaded (/etc/init.d/fr24feed; generated)
Active: active (exited) since Sun 2019-08-11 06:39:13 ADT; 6min ago
Docs: man:systemd-sysv-generator(8)
Process: 23535 ExecStop=/etc/init.d/fr24feed stop (code=exited, status=0/SUCCESS)
Process: 23545 ExecStart=/etc/init.d/fr24feed start (code=exited, status=0/SUCCESS)

systemctl status dump1090-mutability
● dump1090-mutability.service - LSB: dump1090 daemon (mutability variant)
Loaded: loaded (/etc/init.d/dump1090-mutability; generated)
Active: active (exited) since Sun 2019-08-11 06:43:13 ADT; 4min 23s ago
Docs: man:systemd-sysv-generator(8)
Process: 23245 ExecStop=/etc/init.d/dump1090-mutability stop (code=exited, status=0/SUCCESS)
Process: 23804 ExecStart=/etc/init.d/dump1090-mutability start (code=exited, status=0/SUCCESS)

Aug 11 06:43:12 nc4400 systemd[1]: Starting LSB: dump1090 daemon (mutability variant)...
Aug 11 06:43:13 nc4400 systemd[1]: Started LSB: dump1090 daemon (mutability variant).

but no control nor open port 8754

I wonder if there is a new systemd syntax for Xubuntu 18.04 ? why the false positives for ACTIVE?