Public bug reported:

Get that message logged:

systemd-udevd[401]: link_config: autonegotiation is unset or enabled,
the speed and duplex are not writable.

and system settings showing 'wired unmanaged'; that makes network speed
slowing by 50 %

Please check that fix has been really merged:

https://unix.stackexchange.com/questions/413187/is-systemd-links-handling-of-auto-negotiation-broken
https://github.com/systemd/systemd/pull/7808/files

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: systemd 237-3ubuntu8
ProcVersionSignature: Ubuntu 4.15.0-15.16-generic 4.15.15
Uname: Linux 4.15.0-15-generic x86_64
ApportVersion: 2.20.9-0ubuntu4
Architecture: amd64
CurrentDesktop: GNOME
Date: Fri Apr 13 07:11:23 2018
EcryptfsInUse: Yes
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 002: ID 046d:c062 Logitech, Inc. M-UAS144 [LS1 Laser Mouse]
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-15-generic 
root=UUID=2f22752a-ca0f-4cff-b5d7-9754e6154d56 ro
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/23/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P7.30
dmi.board.name: B150M-HDV
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.:bvrP7.30:bd01/23/2018:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB150M-HDV: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.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
modified.conffile..etc.systemd.journald.conf: [modified]
mtime.conffile..etc.systemd.journald.conf: 2018-01-03T11:19:10.780935

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


** Tags: amd64 apport-bug bionic package-from-proposed

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https://bugs.launchpad.net/bugs/1763575

Title:
  link_config: autonegotiation is unset or enabled

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