Debian 11 Bullseye
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Initial Settings : Configure Services2021/08/17

 
To see services status or enable/disable services, Configure like follows.
[1] Display services.
# display services which are running
# to add [--all], display all included inactive servises
# to add [--no-pager], do not use pagers like [less/more]

root@dlp:~#
systemctl -t service

  UNIT                          
  apparmor.service              
  blk-availability.service      
  console-setup.service         
  cron.service                  
  dbus.service                  

.....
.....

  systemd-user-sessions.service 
  user-runtime-dir@0.service    
  user@0.service                

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

# display list of all services' setting

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

UNIT FILE                              STATE           VENDOR PRESET
apparmor.service                       enabled         enabled
apt-daily-upgrade.service              static          -
apt-daily.service                      static          -
autovt@.service                        alias           -
blk-availability.service               enabled         enabled
console-getty.service                  disabled        disabled
console-setup.service                  enabled         enabled

.....
.....

systemd-volatile-root.service          static          -
udev.service                           alias           -
user-runtime-dir@.service              static          -
user@.service                          static          -
x11-common.service                     masked          enabled

115 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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