I have two Neon and one WIN10 PC connected to a new updated FritzBox, the WIN10 shows the correct speedtest result of near 300Mbit
both Neon computers do not ...

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02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)


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sudo ethtool -i enp2s0
driver: r8169
version: 2.3LK-NAPI
firmware-version: rtl8168e-3_0.0.4 03/27/12
expansion-rom-version:
bus-info: 0000:02:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no


sudo ethtool enp2s0
Settings for enp2s0:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Half
        Port: MII
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: off
        Supports Wake-on: pumbg
        Wake-on: g
        Current message level: 0x00000033 (51)
                               drv probe ifdown ifup
        Link detected: yes


and a:
sudo ethtool enp2s0 | grep Speed
shows
Speed: 100Mb/s


both have a Gbit netwaork adapter and both linux show Speed: 100Mb/s instead of Speed: 1000Mb/s
I have tried:

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sudo ethtool -s enp2s0 speed 1000 duplex full autoneg off

but it shows w/ both:

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sudo ethtool -s enp2s0 speed 1000 duplex full autoneg off
Cannot set new settings: Invalid argument
  not setting speed
  not setting duplex
  not setting autoneg


how can I solve this issue and get Gbit speed enabled?

ok, got it ...

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sudo apt-get install r8169-dkms
sudo ethtool -s enp2s0 speed 1000 duplex full


but how can I we make it permanent?
I have tried to put it in my rc.local

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/sbin/ethtool -s enp2s0 speed 1000 duplex full

but it does not work after a reboot

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sudo cat /sys/class/net/enp2s0/speed
100


I have to run:

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sudo ethtool -s enp2s0 speed 1000 duplex full

after KDE login always ...

solved ... by setting half to full and 100mbit to 1000 mbit in the KDE plasma networkmanager

Check the setup for the network connection, linux set defaults to 100Mb/s. Check set allow auto-negotiation