Run the following command to get the list of all the services which are running or are in active state:
systemctl --type=service --state=active
The output should look like this:
UNIT > accounts-daemon.service > acpid.service > apparmor.service > apport.service > atd.service > blk-availability.service > cloud-config.service > cloud-final.service > cloud-init-local.service > cloud-init.service > console-setup.service > cron.service > dbus.service > finalrd.service