Trying to restart SSSD give the following errors with journlctl -xe:
The job identifier is 11972 and the job result is failed.
Sep 25 04:22:56 ROC-Cube systemd[1]: Dependency failed for SSSD Sudo Service responder socket.
░░ Subject: A start job for unit sssd-sudo.socket has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit sssd-sudo.socket has finished with a failure.
░░ 
░░ The job identifier is 12071 and the job result is dependency.
Sep 25 04:22:56 ROC-Cube systemd[1]: sssd-sudo.socket: Job sssd-sudo.socket/start failed with result 'dependency'.
Sep 25 04:22:56 ROC-Cube systemd[1]: Dependency failed for SSSD AutoFS Service responder socket.
░░ Subject: A start job for unit sssd-autofs.socket has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit sssd-autofs.socket has finished with a failure.
░░ 
░░ The job identifier is 11968 and the job result is dependency.
Sep 25 04:22:56 ROC-Cube systemd[1]: sssd-autofs.socket: Job sssd-autofs.socket/start failed with result 'dependency'.
Sep 25 04:22:56 ROC-Cube systemd[1]: Dependency failed for SSSD PAM Service responder socket.
░░ Subject: A start job for unit sssd-pam.socket has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit sssd-pam.socket has finished with a failure.
░░ 
░░ The job identifier is 12073 and the job result is dependency.
Sep 25 04:22:56 ROC-Cube systemd[1]: Dependency failed for SSSD PAM Service responder private socket.
░░ Subject: A start job for unit sssd-pam-priv.socket has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit sssd-pam-priv.socket has finished with a failure.
░░ 
░░ The job identifier is 12074 and the job result is dependency.
Sep 25 04:22:56 ROC-Cube systemd[1]: sssd-pam-priv.socket: Job sssd-pam-priv.socket/start failed with result 'dependency'.
Sep 25 04:22:56 ROC-Cube systemd[1]: sssd-pam.socket: Job sssd-pam.socket/start failed with result 'dependency'.
Sep 25 04:22:56 ROC-Cube systemd[1]: Dependency failed for SSSD SSH Service responder socket.
░░ Subject: A start job for unit sssd-ssh.socket has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit sssd-ssh.socket has finished with a failure.
░░ 
░░ The job identifier is 12070 and the job result is dependency.
Sep 25 04:22:56 ROC-Cube systemd[1]: sssd-ssh.socket: Job sssd-ssh.socket/start failed with result 'dependency'.
Sep 25 04:22:56 ROC-Cube systemd[1]: Dependency failed for SSSD PAC Service responder socket.
░░ Subject: A start job for unit sssd-pac.socket has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit sssd-pac.socket has finished with a failure.
░░ 
░░ The job identifier is 12075 and the job result is dependency.
Sep 25 04:22:56 ROC-Cube systemd[1]: sssd-pac.socket: Job sssd-pac.socket/start failed with result 'dependency'.
Sep 25 04:22:56 ROC-Cube systemd[1]: Dependency failed for SSSD NSS Service responder socket.
░░ Subject: A start job for unit sssd-nss.socket has failed
░░ Defined-By: systemd
░░ Support: http://www.ubuntu.com/support
░░ 
░░ A start job for unit sssd-nss.socket has finished with a failure.
░░ 
░░ The job identifier is 12069 and the job result is dependency.
Sep 25 04:22:56 ROC-Cube systemd[1]: sssd-nss.socket: Job sssd-nss.socket/start failed with result 'dependency'.

And syslog:
root@ROC-Cube:~# tail /var/log/syslog
Sep 25 04:24:47 ROC-Cube systemd[1]: Dependency failed for SSSD PAM Service responder socket.
Sep 25 04:24:47 ROC-Cube systemd[1]: Dependency failed for SSSD PAM Service responder private socket.
Sep 25 04:24:47 ROC-Cube systemd[1]: sssd-pam-priv.socket: Job sssd-pam-priv.socket/start failed with result 'dependency'.
Sep 25 04:24:47 ROC-Cube systemd[1]: sssd-pam.socket: Job sssd-pam.socket/start failed with result 'dependency'.
Sep 25 04:24:47 ROC-Cube systemd[1]: Dependency failed for SSSD SSH Service responder socket.
Sep 25 04:24:47 ROC-Cube systemd[1]: sssd-ssh.socket: Job sssd-ssh.socket/start failed with result 'dependency'.
Sep 25 04:24:47 ROC-Cube systemd[1]: Dependency failed for SSSD PAC Service responder socket.
Sep 25 04:24:47 ROC-Cube systemd[1]: sssd-pac.socket: Job sssd-pac.socket/start failed with result 'dependency'.
Sep 25 04:24:47 ROC-Cube systemd[1]: Dependency failed for SSSD NSS Service responder socket.
Sep 25 04:24:47 ROC-Cube systemd[1]: sssd-nss.socket: Job sssd-nss.socket/start failed with result 'dependency'.