This is mostly for my own reference if I ever need to re-install my Linux OS to have the function keys and media keys working on my Keychron as per the Apple Keyboard. At the time of writing I am using Ubuntu 20.04 LTS and Mint 20.1.

Exact keyboard model is Keychron K2 (v2)

echo 2 | sudo tee /sys/module/hid_apple/parameters/fnmode

Credit: https://superuser.com/questions/79822/how-to-swap-the-fn-use-of-function-keys-on-an-apple-keyboard-in-linux