The fix for this, and obvious intended behaviour is:

 - add 'ntp-servers' to the 'request' directive in /etc/dhcpd3/dhclient.conf
 - add 'default ntp-servers 91.189.94.4' (ntp.ubuntu.com) to 
/etc/dhcpd3/dhclient.conf

I confirm that where the DHCP server doesn't pass the 'ntp-servers'
option, the default is used and written to /etc/ntp.conf.dhcp, which is
then used by ntpd (and otherwise).

It would clearly be more ideal to use 'ntp.ubuntu.com' rather than it's
IP address, but it is the lesser of the two evils, since firewalls may
prevent contacting external NTP servers, causing clock drift and
subsequent NFS issues (eg with 'make'). For this reason, I request that
this report is escalated to a bug, rather than wishlist.

This is readily reproducible with Ubuntu 8.04 HH with stock
installation, and dhcp3-client 3.0.6.dfsg-1ubuntu9.

-- 
Request ntp-servers by default
https://bugs.launchpad.net/bugs/74164
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