NetworkManager-wait-online.service slows down boot

[NickS]

After upgrade to artful, boot is considerable slower. By using systemd-analyze blame I've managed to narrow it to NetworkManager-wait-online.service.
         30.591s NetworkManager-wait-online.service
         10.240s nmbd.service
          9.273s [e-mail]
          9.110s apt-daily.service
          6.485s dev-sdb1.device
          5.488s ModemManager.service
          5.318s udisks2.service
          4.968s accounts-daemon.service
          3.807s fwupd.service
          3.049s grub-common.service
          2.837s apport.service
          2.764s NetworkManager.service
          2.413s speech-dispatcher.service
          2.362s snapd.service
          2.160s networking.service
          2.083s pppd-dns.service
          2.078s lm-sensors.service
          2.073s gpu-manager.service
          2.066s alsa-restore.service
          1.570s smbd.service
          1.380s rsyslog.service
          1.310s polkit.service
          1.117s apparmor.service

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: network-manager 1.8.4-1ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3
Architecture: amd64
CurrentDesktop: Budgie:GNOME
Date: Mon Oct 16 00:18:09 2017
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IpRoute:
 default via 192.168.1.1 dev enp2s0 proto static metric 100
 169.254.0.0/16 dev enp2s0 scope link metric 1000
 192.168.1.0/24 dev enp2s0 proto kernel scope link src 192.168.1.3 metric 100
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
RfKill:

SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH CONNECTION CON-UUID CON-PATH
 enp2s0 ethernet connected /org/freedesktop/NetworkManager/Devices/4 Wired connection 1 066da907-ea49-35a2-8b54-b829cc834081 /org/freedesktop/NetworkManager/ActiveConnection/2
 enp0s18f2u2 ethernet disconnected /org/freedesktop/NetworkManager/Devices/2 -- -- --
 enp0s18f2u2i2 ethernet unavailable /org/freedesktop/NetworkManager/Devices/3 -- -- --
 lo loopback unmanaged /org/freedesktop/NetworkManager/Devices/1 -- -- --
nmcli-nm:
 RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN
 running 1.8.4 connected started full enabled enabled enabled enabled enabled

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Nawaf Al-Subaie (nalsubaie)]

This bug cropped up a few days ago.

 2min 107ms systemd-networkd-wait-online.service
          3.916s plymouth-quit-wait.service
          3.013s iio-sensor-proxy.service
          1.557s snapd.service
          1.119s systemd-backlight@backlight:intel_backlight.service
           991ms apparmor.service
           900ms fwupd.service
Changing the timeout limit from 5 min to 5 sec did not make any difference

[Dimitrios Piliouras (jimpil1985)]

This affects me as well :(. Here is the output of `systemd-analyze time`:

Startup finished in 2.283s (kernel) + 36.155s (userspace) = 38.438s

And here is the output of `systemd-analyze blame`:

         30.025s NetworkManager-wait-online.service
          4.142s vboxdrv.service
          3.692s plymouth-quit-wait.service
          2.646s [e-mail]
          1.454s snapd.service
          1.446s dev-sda1.device
          1.348s grub-common.service
          1.163s fwupd.service
          1.136s apport.service
          1.134s speech-dispatcher.service
           884ms apparmor.service
           828ms pulseaudio.service
           752ms colord.service
           349ms ufw.service

So basically from the 36 seconds it took to boot, 30 of them were for NetworkManager-wait-online.service.

[Karsten Tausche (kt42)]

I am using Ubuntu 17.10 on different machines and noticed this problem only on a machine that was upgraded from earlier Ubuntu version. It does not affect my clean 17.10 installations. Could this be affected by (incompatible) settings of previous releases?

By the way, NetworkManager-wait-online.service blocks for around 30s even if the machine is connected to a wired network.

[Max (mxmax)]

Karsten Tausche, I have a clean install and the service is blocking for 8 secs.

That's still pretty slow, considering my system didn't take too long too boot up in other releases of Ubuntu (~15 secs before, it's now 25 secs).

[Brad Love (b-rad)]

Real hardware running Bionic, MSI b350m prog motherboard with R3 1300x cpu. I must use a usb ethernet due to the onboard ethernet causing PCIe issues. I thought the extended freeze I was experiencing at boot up was caused by hardware driver issues I'm debugging, since I do not even get a log blurb if I hard reset, but I just happened to notice it is this bug by disabling quiet and splash.

The wait-online-service check *never* finishes for me when it is triggered. I've left the PC on in this state for over an hour and it never reached the desktop. I don't know what triggers it, but lately it seems I experience it nine times out of ten boots.

If I boot without the usb ethernet connected (PCIe ethernet drivers disabled) the boot starts immediately.