Fixing System
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2. Installing RequirementThen 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.
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3. Looking up Interface IDFind out your Ethernet Device ID 
 Simply play:ifconfig -a In the output, you should recognize your Ethernet Interface, for example: enp4s0
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4. Fixing Ethernet InterfaceNow 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.
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5. Identify Wi-Fi InterfaceFirst, find your Wi-Fi Device ID: iw dev Look for the line beginning with Interface, for example:wlp2s0
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6. Disable Wi-Fi Power SavingTo avoid performance drops, disable Wi-Fi Power Management: sudo iw dev [DEVICEID] set power_save off Example: sudo iw dev wlp2s0 set power_save off To make it permanent: sudo bash -c 'echo "ACTION=="add", SUBSYSTEM=="net", KERNEL=="wlp*", RUN+="/usr/bin/iw dev %k set power_save off"" > /etc/udev/rules.d/70-wifi-powersave.rules' 
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7. Check Wi-Fi BitrateVerify your Wi-Fi Bitrate: iwconfig Look for Bit Rate=value.
 If it’s low (e.g. 54 Mb/s), you might have interference or wrong band.
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8. Restart and Reassociate Wi-FiReset and reconnect your wireless interface: sudo nmcli device disconnect [DEVICEID] && sudo nmcli device connect [DEVICEID] Example: sudo nmcli device disconnect wlp2s0 && sudo nmcli device connect wlp2s0 
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9. Force 5GHz Band (if Supported)To avoid 2.4GHz interference, prefer 5GHz Band: nm-connection-editor Then navigate to Wi-Fi → Band → A (5GHz)and Save.
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10. Update Wi-Fi Firmware and DriversFinally, update Wi-Fi Firmware and Drivers: sudo apt update && sudo apt install --reinstall linux-firmware sudo ubuntu-drivers autoinstall Then reboot: sudo reboot 
Fixing Ethernet Slow Speed
Thanks to:
phoenixnap.com
Fixing Wi-Fi Slow Speed
Thanks to: phoenixnap.com
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