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How can I make the central server work again?

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I have a central Ubuntu server, which after a while being turned off has stopped working. When I try to turn it on it appears this (part of the identificative information has been eliminated):

emergency.target has finished shutting down.
systemd[1]:  Stopping Emergency Shell...
Subject: Unit emergency.service has begun shutting down
Defined-By:systemd
Support: http://www.ubuntu.com/support

Unit emergency.service has begun shutting down.
systemd[1]: Stopped LVM2 metadata daemon.
Subject: Unit lvm2-lvmetad.service has finished shutting down
Defined-By: systemd
Support: http://www.ubuntu.com/support

Unit lvm2-lvmetad.service has finished shutting down.
systemd[1]: Stopped Emergency Shell.
Subject: Unit emergency.service has finished shutting down 
Defined-By: systemd
Support: http://www.ubuntu.com/support

Unit emergency.service has finished shutting down.
systemd[1]: Listening on Syslog Socket.
Subject: Unit syslog.socket has finished start-up
Defined-By: systemd
Support: http://www.ubuntu.com/support

Unit syslog.socket has finished starting up.

The start-up result is RESULT.
systemd-timesyncd[841]: Synchronized to time server 91.189.  (ntp.ubuntu.com).
systemd[1]: dev-disk-by\x2duuid- .device: Job dev-disk-by\x2duuid- .device/start timed out.
systemd[1]: Timed out waiting for device dev-disk-by\x2duuid-  .device.
Subject: Unit dev-disk-by\x2duuid-  .device has failed
Defined-By: systemd
Support: http://www.ubuntu.com/support

Unit dev-disk-by\x2duuid- .device has failed.

The result is RESULT.
systemd[1]: Dependency failed for /home.
Subject: Unit home.mount has failed
Defined-By: systemd
Support: http://www.ubuntu.com/support

Unit home.mount has failed.

The result is RESULT.
systemd[1]: Dependency failed for Local File Systems.
Subject: Unit local-fs.target has failed
Defined-By: systemd
Support: http://www.ubuntu.com/support

Unit local-fs.target has failed.

The result is RESULT.
systemd[1]: Dependency failed for Clean up any mess left by Odns-up.
Subject: Unit dns-clean.service has failed
Defined-By: systemd
Support: http://www.ubuntu.com/support

Unit dns-clean.service has failed.

The result is RESULT.
systemd[1]: dns-clean.service: Job dns-clean.service/start failed with result 'dependency'.
systemd[1]: local-fs.target: Job local-fs.target/start failed with result 'dependency'.
systemd[1]: local-fs.target: Triggering OnFailure= dependencies.
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