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I've found GNU macchanger to be the easiest way to do that kind of stuff. It's as simple as:

macchanger -r <interface>

Interesting article about macchanger on the Arch Wiki: https://wiki.archlinux.org/index.php/MAC_address_spoofing

I also used macchanger in the past but it seems that recent versions of NetworkManager overwrite the changes that macchanger makes.

Another case where NetworkManager pissed me off. A couple of years ago they broke all third party MAC changers in favor of their built-in solution, but the built-in solution required the bleeding edge head version of wpa_supplicant that no vendor shipped leaving the entire system nonfunctional. IIRC it still doesn't work on Ubuntu 16.

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