Acho que o erro está aqui:
(destaques em negrito)
~$ service cups status
● cups.service - CUPS Scheduler
Loaded: loaded (/lib/systemd/system/cups.service; enabled; vendor preset: ena
Active:
failed (Result: start-limit-hit) since Thu 2019-07-04 15:51:52 -03; 1
Docs: man:cupsd(
Process: 6660 ExecStart=/usr/sbin/cupsd -l (code=killed, signal=TERM)
Main PID: 6660 (code=killed, signal=TERM)
jul 04 15:51:52 procuradoria systemd[1]: Started CUPS Scheduler.
jul 04 15:51:52 procuradoria systemd[1]: cups.service: Main process exited, code
jul 04 15:51:52 procuradoria systemd[1]: cups.service: Succeeded.
jul 04 15:51:52 procuradoria systemd[1]: cups.service: Start request repeated to
jul 04 15:51:52 procuradoria systemd[1]: cups.service: Failed with result 'start
jul 04 15:51:52 procuradoria systemd[1]:
Failed to start CUPS Scheduler.jul 04 15:51:54 procuradoria systemd[1]: cups.service: Start request repeated to
jul 04 15:51:54 procuradoria systemd[1]: cups.service: Failed with result 'start
jul 04 15:51:54 procuradoria systemd[1]:
Failed to start CUPS Scheduler.