Public bug reported:

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 
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 
SourcePackage: systemd
UpgradeStatus: Upgraded to disco on 2019-06-22 (54 days ago) 03/21/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P2.10 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: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.: To Be Filled By O.E.M. 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.

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

** Tags: 19.04 ethernet online systemd wait

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

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