Timesyncd

While ntpd is the standard for time sync, timesyncd is a lighter alternative which is simpler to configure.

To begin, make sure ntpd is removed,

sudo apt purge ntp

Then install timesyncd,

sudo apt install systemd-timesyncd

and start it,

sudo systemctl start systemd-timesyncd
sudo systemctl status systemd-timesyncd

Finally, check the time,

timedatectl