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[Launchpad Bug Tracker <1492546@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ifupdown - 0.8.8ubuntu2

---------------
ifupdown (0.8.8ubuntu2) xenial; urgency=medium

  * inet{,6}.defn: Don't down an interface when stopping. This breaks use
    cases like LTSP which create a "manual" interfaces stanza to prevent
    NetworkManager or other management software from touching the
    interface of the remote root file system. In the past we had the
    check_network_file_systems() check in /etc/init.d/networking that papered
    over this misbehaviour, but that is not being done any more in
    networking.service. (Closes: #809166, LP: #1492546)

 -- Martin Pitt <martin.pitt@xxxxxxxxxx>  Wed, 13 Jan 2016 16:00:49
+0100

** Changed in: ifupdown (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1492546

Title:
  ifdown stops "manual" interfaces on shutdown

Status in ifupdown package in Ubuntu:
  Fix Released
Status in ltsp package in Ubuntu:
  Invalid
Status in ifupdown package in Debian:
  Unknown

Bug description:
  The unit /lib/systemd/system/ifup@.service is Debian and Ubuntu specific, it's not part of upstream systemd.
  On shutdown, it unconditionally ifdowns all interfaces:
    ExecStop=/sbin/ifdown %I

  This is a regression from previous init systems (sysvinit and upstart)
  which cared so that when a network file system was in use, they didn't
  ifdown the interfaces.

  Specifically, both /etc/init.d/networking and /etc/init/networking contain these functions:
    check_network_file_systems()
    check_network_swaps()
  which output the message "not deconfiguring network interfaces: network file systems still mounted" and exit.

  So, please call the same functions in the ExecStop= part of
  ifup@.service.

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