That's the way NTP works, not a bug, it does a progressive change over time, if you want to get the change directly you can use the ntpdate button from the same dialog
** Changed in: gnome-system-tools (Ubuntu) Assignee: (unassigned) => Ubuntu Desktop Bugs Status: Unconfirmed => Rejected -- time-admin does not fetch NTP data after setting NTP server for periodic NTP fetch https://launchpad.net/bugs/27245 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs