# 應該是已經有裝了
sudo apt install systemd-timesyncd
timedatectl set-ntp true
 
sudo systemctl start systemd-timesyncd
 
# check status
sudo systemctl status systemd-timesyncd
 
# edit config
sudo vim /etc/systemd/timesyncd.conf
 
# restart
sudo systemctl restart systemd-timesyncd
 
# check for settings
timedatectl show-timesync --all
 
# logs for checking synchronization
sudo journalctl -u systemd-timesyncd -f

[Time]
NTP=ntp.server.you.want next.server.you.want
#FallbackNTP=ntp.ubuntu.com
#RootDistanceMaxSec=5
#PollIntervalMinSec=32
#PollIntervalMaxSec=2048