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[Launchpad Bug Tracker <1746361@xxxxxxxxxxxxxxxxxx>]

[Expired for cloud-init because there has been no activity for 60 days.]

** Changed in: cloud-init
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1746361

Title:
  AttributeError: 'NoneType' object has no attribute 'version'

Status in cloud-init:
  Expired

Bug description:
  When deploying LXD containers using Juju and MAAS, the LXD containers
  launch with no network connectivity because cloud-init fails with the
  following stack trace:

  Cloud-init v. 17.1 running 'init-local' at Tue, 30 Jan 2018 22:12:46 +0000. Up 1.00 seconds.
  2018-01-30 22:12:47,040 - util.py[WARNING]: failed stage init-local
  failed run of stage init-local
  ------------------------------------------------------------
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 638, in status_wrapper
      ret = functor(name, args)
    File "/usr/lib/python3/dist-packages/cloudinit/cmd/main.py", line 357, in main_init
      init.apply_network_config(bring_up=bool(mode != sources.DSMODE_LOCAL))
    File "/usr/lib/python3/dist-packages/cloudinit/stages.py", line 654, in apply_network_config
      return self.distro.apply_network_config(netcfg, bring_up=bring_up)
    File "/usr/lib/python3/dist-packages/cloudinit/distros/__init__.py", line 170, in apply_network_config
      dev_names = self._write_network_config(netconfig)
    File "/usr/lib/python3/dist-packages/cloudinit/distros/debian.py", line 119, in _write_network_config
      return self._supported_write_network_config(netconfig)
    File "/usr/lib/python3/dist-packages/cloudinit/distros/__init__.py", line 86, in _supported_write_network_config
      renderer.render_network_config(network_config=network_config)
    File "/usr/lib/python3/dist-packages/cloudinit/net/renderer.py", line 53, in render_network_config
      network_state=parse_net_config_data(network_config), target=target)
    File "/usr/lib/python3/dist-packages/cloudinit/net/netplan.py", line 193, in render_network_state
      content = self._render_content(network_state)
    File "/usr/lib/python3/dist-packages/cloudinit/net/netplan.py", line 227, in _render_content
      if network_state.version == 2:
  AttributeError: 'NoneType' object has no attribute 'version'
  ------------------------------------------------------------
  No /sbin/ifup, assuming that it's a netplan system.
  Cloud-init v. 17.1 running 'init' at Tue, 30 Jan 2018 22:12:48 +0000. Up 2.00 seconds.
  ci-info: +++++++++++++++++++++++++++Net device info+++++++++++++++++++++++++++
  ci-info: +--------+------+-----------+-----------+-------+-------------------+
  ci-info: | Device |  Up  |  Address  |    Mask   | Scope |     Hw-Address    |
  ci-info: +--------+------+-----------+-----------+-------+-------------------+
  ci-info: | eth0:  | True |     .     |     .     |   .   | 00:16:3e:8e:77:d5 |
  ci-info: | eth0:  | True |     .     |     .     |   d   | 00:16:3e:8e:77:d5 |
  ci-info: |  lo:   | True | 127.0.0.1 | 255.0.0.0 |   .   |         .         |
  ci-info: |  lo:   | True |     .     |     .     |   d   |         .         |
  ci-info: +--------+------+-----------+-----------+-------+-------------------+

  This problem only seems to affect Juju and MAAS when deploying LXD
  containers on Ubuntu 17.10 systems (which use Netplan) but not on
  16.04.03 LTS systems.

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