Can you attach your /etc/default/lxd-bridge and "sudo systemctl status
lxd-bridge"?

Just confirming that everything looks sane on that front.

It does look like systemd triggers on the interface and expects ifupdown
to configure it, waiting forever for it to do so, despite the
possibility that the interface isn't ifupdown-managed at all and that
there is therefore no way for ifupdown to do anything about it.

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

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

Status in lxd package in Ubuntu:
  Confirmed
Status in systemd 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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