UNIT                LOAD   ACTIVE SUB    DESCRIPTION
● getty@tty2.service  loaded failed failed Getty on tty2
● udev-finish.service loaded failed failed Copy rules generated while the root was ro

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.

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