You can run the following command to list all the running services in Ubuntu:
systemctl list-units --type=service --state=running
Output:
UNIT LOAD ACTIVE SUB DESCRIPTION >
acpid.service loaded active running ACPI event daemon
amazon-cloudwatch-agent.service loaded active running Amazon CloudWatch Agent
cron.service loaded active running Regular background program processing daemon
dbus.service loaded active running D-Bus System Message Bus
getty@tty1.service loaded active running Getty on tty1
irqbalance.service loaded active running irqbalance daemon
....................