i dunno but i can reach ~400Mbps with Manjaro
[jeanmarc@astrolabe ~]$ sudo lshw -class network
[sudo] Mot de passe de jeanmarc : 
  *-network                 
       description: Ethernet interface
       produit: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       fabriquant: Realtek Semiconductor Co., Ltd.
       identifiant matériel: 0
       information bus: pci@0000:03:00.0
       nom logique: enp3s0
       version: 16
       numéro de série: e0:d5:5e:a7:59:ec
       taille: 1Gbit/s
       capacité: 1Gbit/s
       bits: 64 bits
       horloge: 33MHz
       fonctionnalités: pm msi pciexpress msix bus_master cap_list ethernet 
physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8168 
driverversion=8.045.08-NAPI duplex=full ip=192.168.0.26 latency=0 link=yes 
multicast=yes port=twisted pair speed=1Gbit/s
       ressources: irq:133 portE/S:3000(taille=256) mémoire:a3104000-a3104fff 
mémoire:a3100000-a3103fff
[jeanmarc@astrolabe ~]$ uname -a
Linux astrolabe 5.0.9-2-MANJARO #1 SMP PREEMPT Sun Apr 21 07:11:08 UTC 2019 
x86_64 GNU/Linux

thanks

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https://bugs.launchpad.net/bugs/1826581

Title:
  Slow wired Ethernet Realtek 8118

Status in linux package in Ubuntu:
  Confirmed
Status in r8168 package in Ubuntu:
  Confirmed

Bug description:
  Hello,
  Using the latest kernel 5.0.0-13 my network is slower. My MB is a Gigabyte 
B360M-DS3H (Realtek 8118 chipset)

  I got ~22Mbps down on speedtest @1000 (i can reach up to 400Mbps)
  But if i sudo ethtool -s enp3s0 speed 100 duplex full i get up to 92Mbps

  jeanmarc@astrolabe:~$ sudo lshw -class network 
  [sudo] Mot de passe de jeanmarc : 
    *-network                 
         description: Ethernet interface
         produit: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
         fabriquant: Realtek Semiconductor Co., Ltd.
         identifiant matériel: 0
         information bus: pci@0000:03:00.0
         nom logique: enp3s0
         version: 16
         numéro de série: e0:d5:5e:a7:59:ec
         taille: 1Gbit/s
         capacité: 1Gbit/s
         bits: 64 bits
         horloge: 33MHz
         fonctionnalités: pm msi pciexpress msix bus_master cap_list ethernet 
physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
         configuration: autonegotiation=on broadcast=yes driver=r8168 
driverversion=8.047.01-NAPI duplex=full ip=192.168.0.26 latency=0 link=yes 
multicast=yes port=twisted pair speed=1Gbit/s
         ressources: irq:124 portE/S:3000(taille=256) mémoire:a3204000-a3204fff 
mémoire:a3200000-a3203fff

  Thanks
  --- 
  ProblemType: Bug
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jeanmarc   1665 F.... pulseaudio
   /dev/snd/controlC0:  jeanmarc   1665 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  DistroRelease: Ubuntu 19.04
  InstallationDate: Installed on 2018-09-05 (235 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 
(20180725)
  IwConfig:
   lo        no wireless extensions.
   
   enp3s0    no wireless extensions.
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 004: ID 03f0:304a HP, Inc 
   Bus 001 Device 003: ID 0951:1665 Kingston Technology Digital DataTraveler 
SE9 64GB
   Bus 001 Device 002: ID 046d:c069 Logitech, Inc. M-U0007 [Corded Mouse M500]
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Gigabyte Technology Co., Ltd. B360M-DS3H
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: r8168
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-13-generic 
root=UUID=a3da3bcd-b1ad-43de-8e7d-b5afb36efda7 ro quiet splash vt.handoff=1
  ProcVersionSignature: Ubuntu 5.0.0-13.14-generic 5.0.6
  RelatedPackageVersions:
   linux-restricted-modules-5.0.0-13-generic N/A
   linux-backports-modules-5.0.0-13-generic  N/A
   linux-firmware                            1.178
  RfKill:
   
  Tags:  disco
  Uname: Linux 5.0.0-13-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/16/2019
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F12
  dmi.board.asset.tag: Default string
  dmi.board.name: B360M DS3H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrF12:bd01/16/2019:svnGigabyteTechnologyCo.,Ltd.:pnB360M-DS3H:pvrDefaultstring:rvnGigabyteTechnologyCo.,Ltd.:rnB360MDS3H:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.family: Default string
  dmi.product.name: B360M-DS3H
  dmi.product.sku: Default string
  dmi.product.version: Default string
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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