Date Time Often Goes Wrong on Ubuntu

https://askubuntu.com/questions/1314479/ntp-not-supported

This worked for me on Ubuntu:

Install NTP:

apt install systemd-timesyncd

Activate NTP:

timedatectl set-ntp true

Time automatically changes Ubuntu Linux

https://askubuntu.com/questions/1451114/find-out-whether-time-is-updated-automatically

$ sudo apt install systemd-timesyncd