Great. Thanks!
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/etc/dhcp3/dhclient-exit-hooks.d/ntp breaks local NTP server (patch)
https://bugs.launchpad.net/bugs/575458
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Public bug reported:
Binary package hint: ntp
The dhcp exit hook for ntp removes *all* ntp servers from ntp.conf if
the dhcp server provides a new ntp host. This is generally good, unless
your computer *is* an ntp server. In this case, your ntp server won't
work the next time your computer starts