当我尝试时我得到这个：
# systemctl enable systemd-timesyncd.service
Failed to enable unit: Unit file systemd-timesyncd.service does not exist.
NTP 已安装：
# apt-get install ntp
Reading package lists... Done
Building dependency tree
Reading state information... Done
ntp is already the newest version (1:4.2.8p12+dfsg-3ubuntu4.20.04.1).
还：
# timedatectl set-ntp true
Failed to set ntp: NTP not supported