Ubuntu 19.04
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Initial Settings : Service Settings2019/04/22

[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  Load AppArmor profiles
blk-availability.service        loaded active exited  Availability of block dev
console-setup.service           loaded active exited  Set console font and keym
cron.service                    loaded active running Regular background progra
dbus.service                    loaded active running D-Bus System Message Bus
getty@tty1.service              loaded active running Getty on tty1
getty@ttyS0.service             loaded active running Getty on ttyS0
ufw.service                     loaded active exited  Uncomplicated firewall
user-runtime-dir@0.service      loaded active exited  User Runtime Directory /r
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.

38 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-upgrade.service              static
apt-daily.service                      static
autovt@.service                        enabled
blk-availability.service               enabled
user@.service                          static
uuidd.service                          indirect
x11-common.service                     masked

158 unit files listed.
[2] If there are some unnecessary services, it's possible to Stop and turn OFF auto-start setting like follows. (possible to omit [.service] words)
systemctl stop apparmor

systemctl disable apparmor

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