UNIT                        LOAD   ACTIVE SUB     DESCRIPTION
  authdaemond.service         loaded active running Courier Authentification Dae
  avahi-daemon.service        loaded active running Avahi mDNS/DNS-SD Stack
  avahi-dnsconfd.service      loaded active running Avahi DNS Configuration Daem
  courier-imapd.service       loaded active running Courier IMAP Daemon
  dbus.service                loaded active running D-Bus System Message Bus
  [email protected]          loaded active running Getty on tty1
  kmod-static-nodes.service   loaded active exited  Create list of required stat
  lm_sensors.service          loaded active exited  Initialize hardware monitori
  NetworkManager.service      loaded active running Network Manager
  nmbd.service                loaded active running Samba NetBIOS name server
  ntpd.service                loaded active running Network Time Service
  polkit.service              loaded active running Authorization Manager
  rtkit-daemon.service        loaded active running RealtimeKit Scheduling Polic
● shadow.service              loaded failed failed  Verify integrity of password
  smbd.service                loaded active running Samba SMB/CIFS server
  smbnetfs.service            loaded active running Mount Samba Shares
  sshd.service                loaded active running OpenSSH Daemon
  systemd-backlight@backlight:eeepc-wmi.service loaded active exited  Load/Save Screen Backlight B
  systemd-fsck@dev-disk-by\x2duuid-34a2231f\x2d3fe5\x2d40df\x2dbcef\x2d11ae1a83f2c7.service loaded active exited  File System Check on /dev/di
  systemd-fsck@dev-disk-by\x2duuid-d733833a\x2dde17\x2d42af\x2db953\x2d8adeddb182b0.service loaded active exited  File System Check on /dev/di
  systemd-hostnamed.service   loaded active running Hostname Service
  systemd-journald.service    loaded active running Journal Service
  systemd-logind.service      loaded active running Login Service
  systemd-modules-load.service loaded active exited  Load Kernel Modules
  systemd-random-seed.service loaded active exited  Load/Save Random Seed
  systemd-readahead-collect.service loaded active exited  Collect Read-Ahead Data
  systemd-readahead-replay.service loaded active exited  Replay Read-Ahead Data
  systemd-remount-fs.service  loaded active exited  Remount Root and Kernel File
  [email protected] loaded active exited  Load/Save RF Kill Switch Sta
  systemd-sysctl.service      loaded active exited  Apply Kernel Variables
  systemd-tmpfiles-setup-dev.service loaded active exited  Create Static Device Nodes i
  systemd-tmpfiles-setup.service loaded active exited  Create Volatile Files and Di
  systemd-udev-trigger.service loaded active exited  udev Coldplug all Devices
  systemd-udevd.service       loaded active running udev Kernel Device Manager
  systemd-update-utmp.service loaded active exited  Update UTMP about System Boo
  systemd-user-sessions.service loaded active exited  Permit User Sessions
  systemd-vconsole-setup.service loaded active exited  Setup Virtual Console
  udisks2.service             loaded active running Disk Manager
  upower.service              loaded active running Daemon for power management
  [email protected]           loaded active running User Manager for UID 1000
  wpa_supplicant.service      loaded active running WPA supplicant

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.

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