Ubuntu 17.04
Sponsored Link

[1] It's possible to make sure services' status like follows.
# display the list of services which are running

systemctl -t service

UNIT                         LOAD   ACTIVE SUB     DESCRIPTION
accounts-daemon.service      loaded active running Accounts Service
apparmor.service             loaded active exited  LSB: AppArmor initialization
console-setup.service        loaded active exited  Set console keymap
cron.service                 loaded active running Regular background program pr
dbus.service                 loaded active running D-Bus System Message Bus
ufw.service                  loaded active exited  Uncomplicated firewall
user@0.service               loaded active running User Manager for UID 0

LOAD   = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB    = The low-level unit activation state, values depend on unit type.

35 loaded units listed. Pass --all to see loaded but inactive units, too.
To show all installed unit files use 'systemctl list-unit-files'.

# the list of all services' setting

systemctl list-unit-files -t service

UNIT FILE                                  STATE
accounts-daemon.service                enabled
apparmor.service                       enabled
apt-daily.service                      static
autovt@.service                        enabled
user@.service                          static
uuidd.service                          indirect
x11-common.service                     masked

144 unit files listed.
[2] Stop and turn OFF auto-start setting for a service if you don'd need it. (it's Apparmor as an example below)
systemctl stop apparmor

systemctl disable apparmor