How to setup NTP server in ubuntu20?

Reference: https://www.digitalocean.com/community/tutorials/how-to-set-up-time-synchronization-on-ubuntu-20-04 

First, run apt update to refresh your local package index:

sudo apt update

Then, run apt install ntp to install this package:

sudo apt install ntp

ntpd will begin automatically after your installation completes. You can verify that everything is working correctly by querying ntpd for status information:

ntpq -p

If you want to setup a local server:

sudo vim /etc/ntp.conf
---
# Point to our network's master time server
server 192.168.1.234 iburst
restrict default
driftfile /var/lib/ntp/ntp.drift
minpoll 4
maxpoll 5

Then, you can create a drift file as following:

sudo vim /var/lib/ntp/ntp.drift
---
0.000

Finally you can restart the service:

sudo service ntp restart
sudo service ntp status