Public bug reported:

Since that systemd-networkd is enabled, my laptop doesn't boot (hangs)
until I plug in an ethernet cable.

Here is the journal from this boot, note the hang up until I connect my cable 
at 17:51:35:
août 31 17:50:08 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:50:08 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:50:08 tidus systemd[1]: emergency-tmp.service: Cannot add 
dependency job, ignoring: Unit emergency-tmp.service is not loaded properly: 
Inva
août 31 17:50:08 tidus ntpdate[3836]: Can't find host 0.ubuntu.pool.ntp.org: 
Name or service not known (-2)
août 31 17:50:08 tidus ntpdate[3836]: Can't find host 1.ubuntu.pool.ntp.org: 
Name or service not known (-2)
août 31 17:50:08 tidus ntpdate[3836]: Can't find host 2.ubuntu.pool.ntp.org: 
Name or service not known (-2)
août 31 17:50:08 tidus ntpdate[3836]: Can't find host 3.ubuntu.pool.ntp.org: 
Name or service not known (-2)
août 31 17:50:08 tidus ntpdate[3836]: Can't find host ntp.ubuntu.com: Name or 
service not known (-2)
août 31 17:50:08 tidus ntpdate[3836]: no servers can be used, exiting
août 31 17:50:08 tidus systemd[1]: systemd-resolved-update-resolvconf.service: 
Start request repeated too quickly.
août 31 17:50:08 tidus systemd[1]: Failed to start 
systemd-resolved-update-resolvconf.service.
août 31 17:50:08 tidus systemd[1]: systemd-resolved-update-resolvconf.service: 
Failed with result 'start-limit-hit'.
août 31 17:50:08 tidus systemd[1]: Reloading OpenBSD Secure Shell server.
août 31 17:50:08 tidus sshd[2573]: Received SIGHUP; restarting.
août 31 17:50:08 tidus systemd[1]: Reloaded OpenBSD Secure Shell server.
août 31 17:50:08 tidus nm-dispatcher[2511]: /usr/sbin/fanctl: 41: 
/usr/sbin/fanctl: arithmetic expression: expecting primary: " (32-)/4 "
août 31 17:50:08 tidus nm-dispatcher[2511]: run-parts: 
/etc/network/if-up.d/ubuntu-fan exited with return code 2
août 31 17:50:08 tidus sshd[2573]: Server listening on 0.0.0.0 port 22.
août 31 17:50:08 tidus sshd[2573]: Server listening on :: port 22.
août 31 17:50:08 tidus nm-dispatcher[2511]: req:3 'up' [virbr0], 
"/etc/NetworkManager/dispatcher.d/01-ifupdown": complete: failed with Script 
'/etc/Ne
août 31 17:50:08 tidus nm-dispatcher[2511]: req:4 'up' [docker0]: start 
running ordered scripts...
août 31 17:50:08 tidus NetworkManager[2340]: <warn>  [1504194608.6148] 
dispatcher: (6) 01-ifupdown failed (failed): Script '/etc/NetworkManager/dispat
août 31 17:50:08 tidus ntpdate[3908]: Can't find host 0.ubuntu.pool.ntp.org: 
Name or service not known (-2)
août 31 17:50:08 tidus ntpdate[3908]: Can't find host 1.ubuntu.pool.ntp.org: 
Name or service not known (-2)
août 31 17:50:08 tidus ntpdate[3908]: Can't find host 2.ubuntu.pool.ntp.org: 
Name or service not known (-2)
août 31 17:50:08 tidus ntpdate[3908]: Can't find host 3.ubuntu.pool.ntp.org: 
Name or service not known (-2)
août 31 17:50:08 tidus ntpdate[3908]: Can't find host ntp.ubuntu.com: Name or 
service not known (-2)
août 31 17:50:08 tidus ntpdate[3908]: no servers can be used, exiting
août 31 17:50:08 tidus systemd[1]: Reloading OpenBSD Secure Shell server.
août 31 17:50:08 tidus sshd[2573]: Received SIGHUP; restarting.
août 31 17:50:08 tidus systemd[1]: Reloaded OpenBSD Secure Shell server.
août 31 17:50:08 tidus sshd[2573]: Server listening on 0.0.0.0 port 22.
août 31 17:50:08 tidus sshd[2573]: Server listening on :: port 22.
août 31 17:50:08 tidus nm-dispatcher[2511]: /usr/sbin/fanctl: 41: 
/usr/sbin/fanctl: arithmetic expression: expecting primary: " (32-)/4 "
août 31 17:50:08 tidus nm-dispatcher[2511]: run-parts: 
/etc/network/if-up.d/ubuntu-fan exited with return code 2
août 31 17:50:08 tidus nm-dispatcher[2511]: req:4 'up' [docker0], 
"/etc/NetworkManager/dispatcher.d/01-ifupdown": complete: failed with Script 
'/etc/N
août 31 17:50:08 tidus NetworkManager[2340]: <warn>  [1504194608.6612] 
dispatcher: (7) 01-ifupdown failed (failed): Script '/etc/NetworkManager/dispat
août 31 17:50:08 tidus systemd[1]: Reloaded OpenBSD Secure Shell server.
août 31 17:50:08 tidus sshd[2573]: Server listening on 0.0.0.0 port 22.
août 31 17:50:08 tidus sshd[2573]: Server listening on :: port 22.
août 31 17:50:08 tidus nm-dispatcher[2511]: /usr/sbin/fanctl: 41: 
/usr/sbin/fanctl: arithmetic expression: expecting primary: " (32-)/4 "
août 31 17:50:08 tidus nm-dispatcher[2511]: run-parts: 
/etc/network/if-up.d/ubuntu-fan exited with return code 2
août 31 17:50:08 tidus nm-dispatcher[2511]: req:4 'up' [docker0], 
"/etc/NetworkManager/dispatcher.d/01-ifupdown": complete: failed with Script 
'/etc/N
août 31 17:50:08 tidus NetworkManager[2340]: <warn>  [1504194608.6612] 
dispatcher: (7) 01-ifupdown failed (failed): Script '/etc/NetworkManager/dispat
août 31 17:50:09 tidus set-cpufreq[2212]: Setting powersave scheduler for all 
CPUs
août 31 17:50:11 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:50:11 tidus NetworkManager[2340]: <info>  [1504194611.8168] device 
(wlan0): supplicant interface state: ready -> inactive
août 31 17:50:13 tidus NetworkManager[2340]: <info>  [1504194613.5139] 
manager: startup complete
août 31 17:50:13 tidus systemd[1]: Started Network Manager Wait Online.
août 31 17:50:14 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:50:15 tidus NetworkManager[2340]: <info>  [1504194615.5127] 
manager: rfkill: WiFi hardware radio set enabled
août 31 17:50:15 tidus NetworkManager[2340]: <info>  [1504194615.5128] 
manager: rfkill: WWAN hardware radio set enabled
août 31 17:50:23 tidus systemd[1]: Received SIGRTMIN+20 from PID 318 
(plymouthd).
août 31 17:50:26 tidus ModemManager[2243]: <info>  Creating modem with plugin 
'Generic' and '1' ports
août 31 17:50:26 tidus ModemManager[2243]: <warn>  Could not grab port 
(tty/ttyS4): 'Cannot add port 'tty/ttyS4', unhandled serial type'
août 31 17:50:26 tidus ModemManager[2243]: <warn>  Couldn't create modem for 
device at '/sys/devices/pci0000:00/0000:00:16.3': Failed to find primary 
août 31 17:50:26 tidus systemd[1]: Received SIGRTMIN+20 from PID 318 
(plymouthd).
août 31 17:50:38 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:51:11 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:51:35 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:51:35 tidus NetworkManager[2340]: <info>  [1504194695.4659] device 
(eth0): link connected
août 31 17:51:35 tidus systemd-networkd[2036]: eth0: Gained carrier
août 31 17:51:35 tidus kernel: e1000e: eth0 NIC Link is Up 1000 Mbps Full 
Duplex, Flow Control: Rx/Tx
août 31 17:51:35 tidus kernel: IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link 
becomes ready
août 31 17:51:35 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:51:35 tidus NetworkManager[2340]: <info>  [1504194695.4672] device 
(eth0): state change: unavailable -> disconnected (reason 'carrier-chang
août 31 17:51:35 tidus systemd[1]: emergency-tmp.service: Cannot add 
dependency job, ignoring: Unit emergency-tmp.service is not loaded properly: 
Inva
août 31 17:51:35 tidus systemd-networkd-wait-online[2047]: ignoring: lo
août 31 17:51:35 tidus NetworkManager[2340]: <info>  [1504194695.4710] policy: 
auto-activating connection 'Client'
août 31 17:51:35 tidus NetworkManager[2340]: <info>  [1504194695.4726] device 
(eth0): Activation: starting connection 'Client' (f33096ed-0a9e-4661-afe
août 31 17:51:35 tidus NetworkManager[2340]: <info>  [1504194695.4729] device 
(eth0): state change: disconnected -> prepare (reason 'none', internal s


Note that disabling both networkd related services "fix" it for me.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: systemd 234-2ubuntu9
ProcVersionSignature: Ubuntu 4.12.0-11.12-generic 4.12.5
Uname: Linux 4.12.0-11-generic x86_64
NonfreeKernelModules: zfs zunicode zavl zcommon znvpair
ApportVersion: 2.20.7-0ubuntu1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Thu Aug 31 18:17:56 2017
InstallationDate: Installed on 2012-05-28 (1921 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
MachineType: LENOVO 4287CTO
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.12.0-11-generic 
root=UUID=a9f4b475-e4ce-45ed-aa33-9b92e52c49b0 ro quiet splash nomdmonddf 
nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw 
nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf 
nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
SourcePackage: systemd
UpgradeStatus: Upgraded to artful on 2017-07-10 (52 days ago)
dmi.bios.date: 02/14/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET58WW (1.28 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4287CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: 
dmi:bvnLENOVO:bvr8DET58WW(1.28):bd02/14/2012:svnLENOVO:pn4287CTO:pvrThinkPadX220:rvnLENOVO:rn4287CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.family: ThinkPad X220
dmi.product.name: 4287CTO
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful wayland-session

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https://bugs.launchpad.net/bugs/1714301

Title:
  systemd-networkd hangs my boot (wireless)

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