I was able to reproduce the issue in Debian Stretch after applying an
Ubuntu specific patch to it. So I'm suspecting that Ubuntu's etwork-
manager might be involved in this, I've put it to the affects list.

Specifically, by editing Debian's /lib/systemd/system/NetworkManager.service 
like this:
-After=network-pre.target dbus.service
+Wants=network.target
+Before=network.target

...the dependency cycle error was affecting Debian too.

Tomorrow I'll try the opposite, to revert the Ubuntu .diff from
/lib/systemd/system/NetworkManager.service and see if it solves the
issue.

** Also affects: network-manager (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1487679

Title:
  Breaking ordering cycle by deleting job nbd-client.service/start

Status in nbd package in Ubuntu:
  Triaged
Status in network-manager package in Ubuntu:
  New

Bug description:
  $ lsb_release -rd
  Description:  Ubuntu 15.04
  Release:      15.04

  $ apt-cache policy nbd-client
  nbd-client:
    Installed: 1:3.8-4ubuntu0.1
    Candidate: 1:3.8-4ubuntu0.1
    Version table:
   *** 1:3.8-4ubuntu0.1 0
          500 http://ch.archive.ubuntu.com/ubuntu/ vivid-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu/ vivid-security/main amd64 
Packages
          100 /var/lib/dpkg/status
       1:3.8-4 0
          500 http://ch.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages

  I'm using the nbd-client to mount some raw disk images over the
  network but starting the nbd-client automatically during bootup does
  not happen due to the following:

  Aug 22 08:54:20 fractal kernel: [   11.875885] systemd[1]: Found dependency 
on nbd-client.service/start
  Aug 22 08:54:20 fractal kernel: [   11.875890] systemd[1]: Breaking ordering 
cycle by deleting job nbd-client.service/start
  Aug 22 08:54:20 fractal kernel: [   11.875891] systemd[1]: Job 
nbd-client.service/start deleted to break ordering cycle starting with 
basic.target/start

  Meaning after boot, I have to manually run `sudo ndb-client start`
  every time I want to access these images. Note that this is no
  diskless system, the images I mount via NBD do not contain the local
  system, they are totally unrelated.

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