I cannot.  I have not been able to get a console on the systems
where I can reproduce the bug.

Ok, I guess what I need to do is script a systemd job which detects
that lxd is configured;  reboots after 5 minutes with lxd
disabled.  Then I'll be able to log in.

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https://bugs.launchpad.net/bugs/1569064

Title:
  ifupdown wants to configure interfaces it shouldn't (lxdbr0)

Status in ifupdown package in Ubuntu:
  Confirmed
Status in lxd package in Ubuntu:
  Confirmed

Bug description:
  The reproducer:

  create a xenial vm.  There, run

  lxc launch ubuntu:

  leave that container running, and reboot.  If you're "lucky",
  networking will never come up:

  [[0;32m  OK  [0m] Found device /sys/subsystem/net/devices/lxdbr0.
  [[0m[0;31m*     [0m] A start job is running for Raise network interfaces (32s 
/ 5min 11s)[K[[0;1;31m*[0m[0;31m*    [0m]
   A start job is running for Raise network interfaces (33s / 5min 
11s)[K[[0;31m*[0;1;31m*[0m[0;31m*   [0m] A start job i
  s running for Raise network interfaces (34s / 5min 11s)[K[ 
[0;31m*[0;1;31m*[0m[0;31m*  [0m] A start job is running for
  Raise network interfaces (34s / 5min 11s)[K[  [0;31m*[0;1;31m*[0m[0;31m* [0m] 
A start job is running for Raise network
  interfaces (35s / 5min 11s)[K[   [0;31m*[0;1;31m*[0m[0;31m*[0m] A start job 
is running for Raise network interfaces (35
  s / 5min 11s)[K[    [0;31m*[0;1;31m*[0m] A start job is running for Raise 
network interfaces (36s / 5min 11s)[K[     [0
  ;31m*[0m] A start job is running for Raise network interfaces (37s / 5min 
11s)[K[    [0;31m*[0;1;31m*[0m] A start job i

  (etc)

  I can reproduce this 100% on serverstack (openstack) instances.  I
  cannot reproduce it locally with uvt-kvm.

  What appears to be happening is that lxd starts lxd-bridge which
  creates lxdbr0 with no ipv4 address;  this racily happens before
  systemd does its networking setup;  said network setup then sees
  lxdbr0 and wants to configure it, so waits for it to have an ip
  address.  Plausible?

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