There is one regression potential I can see:

- users that relied on starting NTP later on after other interfaces got
up due to that code in ntpdate which did that as a side effect. But that
is outweigh by Case2/3 for the majority of users. And even Case1 only
hits this potential regression on e.g. late network intialization, but
in that case please remind that the default (systemd timedatectl) would
handle that.

- Since most users of ntp do not install ntpdate (which doesn't work
when ntp is active) we should be rather safe to assume that almost no
one should rely on that side effect.

- Furthermore this is a Ubuntu Delta for very long, cause issues (see
the references on the git commit) but never made it into Debian - in
that sense another indicator it isn't an important delta to have.

Note: The original intention "what if net is available too late" fixed
correctly would not be part of ntpdate, but ntp and additionally check
if it is actually meant to be enabled.

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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/1593907

Title:
  ntpdate startup routine prevents ntp service from launching up on
  Ubuntu 16.04 server on system boot; manually starting ntp service
  works: [FIX in DESCRIPTION], just need to apply it and release a new
  version

Status in ntp package in Ubuntu:
  Fix Released
Status in ntp source package in Xenial:
  Triaged
Status in ntp source package in Yakkety:
  Triaged
Status in ntp source package in Zesty:
  Triaged

Bug description:
  I've installed ntp service on the clean ubuntu 16.04 server system. 
Configured it. Checked that it works, but, after reboot, it doesn't start 
automatically.
  When I check: 'systemctl is-enabled ntp', it shows enabled.
  If I manually start it 'systemctl start ntp' it starts just fine and woks 
correctly,
  but until I manually start it, 'systemctl status ntp' shows:

      Loaded: loaded (/etc/init.d/ntp; bad; vendor preset: enabled)
      Active: inactive (deadi)

  Installed 1.29ubuntu2 version of init-systems-helper, but it didn't
  fix the problem.

  Found a bugreport on ntpd package:

      https://bugs.launchpad.net/ubuntu/+source/ntp/+bug/1577596

  led to solution that involves a change to be made in file:

      /etc/network/if-up.d/ntpdate

  of ntpdate package

  After changing from:
  ______________CODE_START______________

      invoke-rc.d --quiet $service stop >/dev/null 2>&1 || true

       # Avoid running more than one at a time
       flock -n /run/lock/ntpdate /usr/sbin/ntpdate-debian -s $OPTS 2>/dev/null 
|| :

      invoke-rc.d --quiet $service start >/dev/null 2>&1 || true

  ______________CODE_END______________

  to:
  ______________CODE_START______________

      systemctl --quiet stop $service.service >/dev/null 2>&1 || true

       # Avoid running more than one at a time
       flock -n /run/lock/ntpdate /usr/sbin/ntpdate-debian -s $OPTS 2>/dev/null 
|| :

      systemctl --quiet start $service.service >/dev/null 2>&1 || true

  ______________CODE_END______________

  ntpd service started launching on boot.

  System Information:

    lsb_release -rd:

      Description:    Ubuntu 16.04 LTS
      Release:        16.04

    apt-cache policy ntpdate:

      ntpdate:
        Установлен: 1:4.2.8p4+dfsg-3ubuntu5
        Кандидат:   1:4.2.8p4+dfsg-3ubuntu5
        Таблица версий:
       *** 1:4.2.8p4+dfsg-3ubuntu5 500
              500 http://ru.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
              100 /var/lib/dpkg/status

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