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MSI MPG B650 CARBON WIFI / Realtek RTL8125 LAN

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    MSI MPG B650 CARBON WIFI / Realtek RTL8125 LAN

    I have recently built a new Kubuntu desktop machine using the MSI mainboard given in the subject of this post. On the mainboard is a LAN port that comes from Realtek. Running the command "ifconfig" I get the following output.
    enp12s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
    inet 192.168.178.23 netmask 255.255.255.0 broadcast 192.168.178.255
    inet6 fe80::8802:3788:9b01:e525 prefixlen 64 scopeid 0x20<link>
    ether 04:7c:16:47:40:c1 txqueuelen 1000 (Ethernet)
    RX packets 357411 bytes 419844628 (419.8 MB)
    RX errors 0 dropped 4864 overruns 0 frame 0
    TX packets 255684 bytes 148790447 (148.7 MB)
    TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0



    ​Running the command "sudo ethtool --show-eee enp12s0" I get the following output:
    EEE settings for enp12s0:
    EEE status: enabled - active
    Tx LPI: disabled
    Supported EEE link modes: 100baseT/Full
    1000baseT/Full
    Advertised EEE link modes: 100baseT/Full
    1000baseT/Full
    Link partner advertised EEE link modes: 100baseT/Full
    1000baseT/Full



    The output from "lspci" includes the line:
    0c:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller (rev 05)


    ​All of the many different speed test tools for testing speed to the internet show that I don't manage to get anything more than 100Mb
    The network cable is a CAT7, it is connected to a Netgear GS108E switch and both of the green lights say I ought to be seeing 10000Mb

    Any ideas on what I need to do to be able to get the network interface to go faster?
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