Thanks for your report. I think you were right, this is a problem in ntp
and not in the gnome-system-tools. But luckily, I believe I've already
seen this problem, which has its root cause in yet another package (gdm-
guest-session).
The interesting part of the log is:
> Setting up ntp (1:4.2.4p6+d
** Package changed: ntp (Ubuntu) => gnome-system-tools (Ubuntu)
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NTP services installation crashes
https://bugs.launchpad.net/bugs/479493
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