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Fix Slow Internet Speed on Ubuntu 22.04 (Ethernet & Wi-Fi Guide)

October 23, 2025 | By the+gnu+linux+evangelist.

Fixing Ethernet

  1. 2. Installing Requirement

    Then to Install Required Software for Ethernet
    Run:

    sudo apt install ethtool

    Authenticate with the User Admin Password.
    If Got “User is Not in Sudoers file” then see:
    How to Enable sudo.

  2. 3. Looking up Interface ID

    Find out your Ethernet Device ID
    Simply play:

    ifconfig -a

    In the output, you should recognize your Ethernet Interface, for example: enp4s0

  3. 4. Fixing Ethernet Interface

    Now to Fix Ethernet Speed and Duplex
    Run:

    sudo ethtool -s [DEVICEID] speed 1000 duplex full autoneg on

    Example:

    sudo ethtool -s enp4s0 speed 1000 duplex full autoneg on

    Auto-Negotiation allows the device to choose the best performance mode based on its counterpart.
    Full-duplex enables simultaneous sending and receiving of packets.

    4. Thanks to:
    phoenixnap.com

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