I find that Ubuntu 20.04 does not install ntp any more. Then, how do you manage time synchronisation in Ubuntu 20.04?
Add the universe repo to repositories. Install ntp and ntpdate. Code: [email protected]:~$ lsb_release -a No LSB modules are available. Distributor ID: Ubuntu Description: Ubuntu 20.04.3 LTS Release: 20.04 Codename: focal [email protected]:~$ apt policy ntp ntp: Asennettu: (ei mitään) Ehdokas: 1:4.2.8p12+dfsg-3ubuntu4.20.04.1 Versiotaulukko: 1:4.2.8p12+dfsg-3ubuntu4.20.04.1 500 500 http://fi.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages 500 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages 1:4.2.8p12+dfsg-3ubuntu4 500 500 http://fi.archive.ubuntu.com/ubuntu focal/universe amd64 Packages [email protected]:~$ apt policy ntpdate ntpdate: Asennettu: (ei mitään) Ehdokas: 1:4.2.8p12+dfsg-3ubuntu4.20.04.1 Versiotaulukko: 1:4.2.8p12+dfsg-3ubuntu4.20.04.1 500 500 http://fi.archive.ubuntu.com/ubuntu focal-updates/universe amd64 Packages 500 http://security.ubuntu.com/ubuntu focal-security/universe amd64 Packages 1:4.2.8p12+dfsg-3ubuntu4 500 500 http://fi.archive.ubuntu.com/ubuntu focal/universe amd64 Packages
You probably do have something installed, maybe systemd-timesyncd, which is probably good enough for a hosting server. Hardware nodes that run virtual environments on them and use clustering may need to use something more precise like ntp or (I think, but verify) chrony.
