Thanks for the update Robie.  I was not aware of ntpdate being
deprecated (appears to have been deprecated years ago).

For those like myself that require ntpd (the suggested alternative
systemd-timesyncd uses sntp which may not suffice in all use cases), I
think the best fix/workaround is to merely remove the ntpdate package. I
didn't really use ntpdate anymore and suspect it was still installed
from an earlier version of Ubuntu in my case (I've performed a fair
number of inline upgrades on system).

Historically, ntpdate was run prior to starting ntpd in case the clock
was too far off for ntpd to sync.  In looking at the ntp package
further, I see that /etc/default/ntp includes the '-g' option which
allows ntpd to perform a one time sync that would accommodate a clock
with any delta.  This in itself makes ntpdate unneeded for those running
ntp service.  Additionally, ntpd can also be run with arguments to
simulate behavior of ntpdate if needed.

So, if I understand correctly, the ntp package really has no bug (at
least related to starting at boot).  Issue was really due to bug with
deprecated ntpdate package which should be removed if running ntp
anyway.

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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to ntp in Ubuntu.
https://bugs.launchpad.net/bugs/1577596

Title:
  ntpd not started when using ntpdate

Status in init-system-helpers package in Ubuntu:
  Confirmed
Status in ntp package in Ubuntu:
  Won't Fix

Bug description:
  After updating from 14.04 to 16.04 on a number of my systems, ntpd no
  longer starts at boot on any of those systems.

  `systemctl status ntp` shows:
     ntp.service - LSB: Start NTP daemon
     Loaded: loaded (/etc/init.d/ntp; bad; vendor preset: enabled)
     Active: inactive (dead)
       Docs: man:systemd-sysv-generator(8)
  May 02 19:10:14 host systemd[1]: Stopped LSB: Start NTP daemon.
  May 02 19:10:17 host systemd[1]: Stopped LSB: Start NTP daemon.

  Manually starting it using `systemctl start ntp` works fine.  However,
  systemd does not seem to want to start it automatically at boot time.


  As best as I can tell based on trial and error, there is something
  special about the combination of the service being named "ntp.service"
  and the service depending on network.target.  However, I haven't been
  able to identify exactly what is causing this.

  If I copy the init script to any other name, everything works fine:
  cp /etc/init.d/ntp /etc/init.d/ntpd
  Edit /etc/init.d/ntpd and change "Provides: ntp" to "Provides: ntpd"
  systemctl enable ntpd
  # After a reboot, ntpd.service is started, but ntp.service is not.

  If I remove "$network" from the "# Required-Start: $network $remote_fs
  $syslog" line in /etc/init.d/ntp, then systemd starts it automatically
  ... But of course it is started before the network comes up, so it
  fails.

  If I replace /etc/init.d/ntp with a file containing only the following, 
systemd won't try to start it automatically at boot:
  #!/bin/sh
  ### BEGIN INIT INFO
  # Provides: ntp
  # Required-Start: $network
  # Required-Stop: $network
  # Default-Start: 2 3 4 5
  # Default-Stop: 1
  # Short-Description: Start NTP daemon
  ### END INIT INFO
  echo "script was run" >> /ntp.log

  If I rename that same dummy script to /etc/init.d/ntp2, it is started
  automatically at boot.

  However, grepping the systemd source code and my systemd config files for ntp 
doesn't seem to find anything that might cause this behavior:
  /etc/systemd# grep -iR ntp *
  timesyncd.conf:#NTP=
  timesyncd.conf:#FallbackNTP=ntp.ubuntu.com
  /lib/systemd# grep -R ntp *
  
system/systemd-timesyncd.service.d/disable-with-time-daemon.conf:ConditionFileIsExecutable=!/usr/sbin/ntpd
  
system/systemd-timesyncd.service.d/disable-with-time-daemon.conf:ConditionFileIsExecutable=!/usr/sbin/openntpd
  Binary file systemd-networkd matches
  Binary file systemd-timedated matches
  Binary file systemd-timesyncd matches

  What else can I do to debug this further?

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