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I have an Ubuntu 14.04 and I am trying to start cron service without success. I always get this after running service cron start:

Job for cron.service failed because the control process exited with error code.

systemctl status cron.service says that the cron service is loaded but failed:

cron.service

   Loaded: loaded (/etc/init.d/cron; bad; vendor preset: enabled)

   Active: failed (Result: exit-code) since Fri 2018-06-15 09:06:19 AWST; 6min ago

     Docs: man:systemd-sysv-generator(8)

  Process: 22707 ExecStart=/etc/init.d/cron start (code=exited, status=1/FAILURE)



 cron[22707]: Rather than invoking init scripts through /etc/init.d, use the service(8)

 cron[22707]: utility, e.g. service cron start

 cron[22707]: initctl: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused

 cron[22707]: Since the script you are attempting to invoke has been converted to an

 cron[22707]: Upstart job, you may also use the start(8) utility, e.g. start cron

 cron[22707]: start: Unable to connect to Upstart: Failed to connect to socket /com/ubuntu/upstart: Connection refused

 systemd[1]: cron.service: Control process exited, code=exited status=1

 systemd[1]: Failed to start cron.service.

 systemd[1]: cron.service: Unit entered failed state.

 systemd[1]: cron.service: Failed with result 'exit-code'.

Any hint on how to make cron service to successfully start?

I encountered similar issue, and this is what I was seeing

 systemctl status crond.service

● crond.service - Command Scheduler

   Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled; vendor preset: enabled)

   Active: failed (Result: exit-code) since Thu 2019-02-07 13:34:38 EST; 2min 37s ago

  Process: 31470 ExecStart=/usr/sbin/crond -n $CRONDARGS (code=exited, status=1/FAILURE)

 Main PID: 31470 (code=exited, status=1/FAILURE)

What I did to resolve this by checking my cron log. I am running in rhel, and my log is at /var/log/cron, my issue was due to this
...(CRON) DEATH (can't lock /var/run/crond.pid, other pid may be 31364): Resource temporarily unavailable

so I just did

pkill -f crond

then

systemctl start crond.service 

then it's back to normal

systemctl status crond.service

● crond.service - Command Scheduler

   Loaded: loaded (/usr/lib/systemd/system/crond.service; enabled; vendor preset: enabled)

   Active: active (running) since Thu 2019-02-07 13:37:19 EST; 1s ago

 Main PID: 31490 (crond)

   CGroup: /system.slice/crond.service

           └─31490 /usr/sbin/crond -n