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Do a web search with duckduckgo for "generate mac address"
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Note the MAC address
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Open the ternminal
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Get a root shell
sudo -i- Get the device name
ip link show-
Note device name (ex: enp0s25)
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Clear the device record (may be optional)
ip link set dev DEVICENAMEHERE- Set the new MAC address
ip link set dev DEVICENAMEHERE address NEWMACADDRESSHERE- Restart the device, applying the new MAC address
ip link set dev DEVICENAMEHERE up- Verify that the MAC has changed
ip link show- Close the root terminal
logout