[Router] 3912s HostClockNotSynchronising

By default NTP is not enabled on Ubuntu

admin@Vigor3912:~$ timedtimedatectl status
               Local time: Wed 2023-03-01 18:45:33 +07
           Universal time: Wed 2023-03-01 11:45:33 UTC
                 RTC time: Wed 2023-03-01 11:17:43
                Time zone: Asia/Bangkok (+07, +0700)
System clock synchronized: no
              NTP service: n/a
          RTC in local TZ: no

Then we need enable it

sudo apt install ntp
sudo apt install systemd-timesyncd
sudo timedatectl set-ntp true

And done

admin@Vigor3912:~$ sudo timedatectl status
               Local time: Wed 2023-03-01 18:47:19 +07
           Universal time: Wed 2023-03-01 11:47:19 UTC
                 RTC time: Wed 2023-03-01 11:47:10
                Time zone: Asia/Bangkok (+07, +0700)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no