For the sake of karma to save others probably hours... ;-) The /etc/ntpsec/ntp.conf
contained this line: tos minclock 4 minsane 3 This makes the ntpd require at least four clock sources and three of them sane. Otherwise the ntpd will not sync the clock. After commenting this line out the sync works like a charm. I wonder why such a breaking config change did not show up in the debian releasenotes? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2103691 Title: ntpd from ntpsec does not synchronize To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ntpsec/+bug/2103691/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs