Solution

There are different solutions for this but the following one worked the best for me:

First remove NTP:

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sudo apt remove ntp

and install the systemd-native timesync service:

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sudo apt install systemd-timesyncd

This should automatically install the service and start it. To make sure, you can check that systemd-timesyncd.service is active (running):

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systemctl status systemd-timesyncd

And when using:

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timedatectl status

you should see something like:

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System clock synchronized: yes
              NTP service: active

References

• https://askubuntu.com/a/1373363