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[Launchpad Bug Tracker <1737640@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-fan - 0.12.9~17.10.1

---------------
ubuntu-fan (0.12.9~17.10.1) artful; urgency=medium

  [ Andy Whitcroft ]
  * fanctl: fix config_filename when the interface does not have a width
    (LP: #1737640)

 -- Stefan Bader <stefan.bader@xxxxxxxxxxxxx>  Tue, 30 Jan 2018 10:54:13
+0100

** Changed in: ubuntu-fan (Ubuntu Artful)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1737640

Title:
  [SRU] /usr/sbin/fanctl: arithmetic expression: expecting primary |
  unconfigured interfaces cause ifup failures

Status in juju:
  Invalid
Status in OPNFV:
  Invalid
Status in ubuntu-fan package in Ubuntu:
  Fix Released
Status in ubuntu-fan source package in Xenial:
  Fix Released
Status in ubuntu-fan source package in Zesty:
  Won't Fix
Status in ubuntu-fan source package in Artful:
  Fix Released
Status in ubuntu-fan source package in Bionic:
  Fix Released

Bug description:
  [Impact]

   * This bug effects anyone deploying LXD with juju on a machine with
  interfaces configured as IP/mask. Since this is a very common use
  case, SRU is needed.

  [Test Case]

   * Detailed process can be seen at https://paste.ubuntu.com/26169937/

  [Regression Potential]

   * Potential for regression is low because of the nature of the error.
  It's just missing a case stanza for interfaces that are defined with
  IP/mask

  [Other Info]

   * Original report:

  I'm seeing this error as the status of multiple containers in my
  deploy:

  http://paste.ubuntu.com/26166720/

  I can't connect to the parent machines anymore either - it seems
  networking is totally hosed on the machines.

  This is with juju 2.3.1.

  [SRU Justification]

  == Impact ==

  Due to unexpectedly passing up a non-critical error to the ifup hooks,
  this causes network interfaces to not come up.

  == Fix ==

  This was fixed in Xenial (and already forward ported to Bionic)
  effectively allowing to bring up network interfaces via ifupdown after
  installing ubuntu-fan.

  == Testcase ==

  Basic installation with ifupdown method for configuring network
  interfaces (no longer default for Artful and later). Then installing
  ubuntu-fan and either reboot or use ifdown -a && ifup -a in case of
  being logged in locally. Without the fix interfaces will not come up
  properly.

  == Regression Risk ==

  Minimal, well tested in Xenial and not impacting Artful and later if
  ifupdown is not used.

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