[Bug 1840359] Re: systemd-networkd-wait-online & two ethernet on board

[Dan Streetman]

Your netplan config has enp3s0 as your main interface, and by default
that is required for boot, which is why your boot is delayed when you
don't have it connected.

Change your netplan 01-netcfg.yaml file to:

# This file describes the network interfaces available on your system
# For more information, see netplan(5).
network:
  version: 2
  renderer: networkd
  ethernets:
    enp3s0:
      dhcp4: yes
      optional: yes
    enp0s31f6:
      dhcp4: yes
      optional: yes

that should start dhcp4 on both your ethernet ports, but also won't
delay your boot.  See the netplan man page for more details about its
config params.

** Changed in: systemd (Ubuntu)
       Status: New => Incomplete

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Title:
  systemd-networkd-wait-online & two ethernet on board

Status in systemd package in Ubuntu:
  Incomplete

Bug description:
  Since I've upgraded to 19.04 my boot was 3 minutes longer due to wait for network. I've tried many tricks, but today I have finally found the source = the bug.
  My PC has motherboard AsRock Z370M-ITX/ac which has 2 Ethernet ports. When I connect Ethernet cable just to the "first" device "enp3s0" boot is quick, when I connect Ethernet cable just to the "second" device "enp0s31f6" boot is about 3 minutes longer.

  It simply waits for the "enp3s0" device.

  Since there is no mark on the board or on the rear panel which port is
  "first" and which is "second" it's clear that the failure is on Ubuntu
  19.04 side. Ubuntu 18.04 LTS has no such problem.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: systemd 240-6ubuntu5.3
  ProcVersionSignature: Ubuntu 5.0.0-25.26-generic 5.0.18
  Uname: Linux 5.0.0-25-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27.1
  Architecture: amd64
  CurrentDesktop: Unity:Unity7:ubuntu
  Date: Thu Aug 15 21:55:12 2019
  InstallationDate: Installed on 2017-12-22 (600 days ago)
  InstallationMedia: Ubuntu-Server 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-25-generic root=UUID=d383d414-f179-4df7-a8f3-890dacf8ca33 ro modprobe.blacklist=nouveau intel_iommu=on
  SourcePackage: systemd
  UpgradeStatus: Upgraded to disco on 2019-06-22 (54 days ago)
  dmi.bios.date: 03/21/2018
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P2.10
  dmi.board.name: Z370M-ITX/ac
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.10:bd03/21/2018:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ370M-ITX/ac:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.sku: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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