Ubuntu 20.04
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Initial Settings : Service Settings2020/04/24

 
To see services status or enable/disable services, Configure like follows.
[1] Display services.
# display services which are running

root@dlp:~#
systemctl -t service

  UNIT                                 LOAD   ACTIVE SUB     DESCRIPTION       >
  accounts-daemon.service              loaded active running Accounts Service  >
  apparmor.service                     loaded active exited  Load AppArmor prof>
  apport.service                       loaded active exited  LSB: automatic cra>
.....
.....
  unattended-upgrades.service          loaded active running Unattended Upgrade>
  user-runtime-dir@0.service           loaded active exited  User Runtime Direc>
  user@0.service                       loaded active running User Manager for U>

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.

48 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

root@dlp:~#
systemctl list-unit-files -t service

UNIT FILE                              STATE           VENDOR PRESET
accounts-daemon.service                enabled         enabled
apparmor.service                       enabled         enabled
apport-autoreport.service              static          enabled
apport-forward@.service                static          enabled
apport.service                         generated       enabled
.....
.....
xfs_scrub@.service                     static          enabled
xfs_scrub_all.service                  static          enabled
xfs_scrub_fail@.service                static          enabled

194 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)
root@dlp:~#
systemctl stop apparmor

root@dlp:~#
systemctl disable apparmor

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