I bought a USB keyboard/touchpad. As the keyboard has F1,...,F12 and 1,...,' on the same keys, resp., w/ F1,...,F12 triggered by holding down fn or ALT, I'd like to bind a key combo to toggle fn or ALT up/down. (How) can I do this? As F11-F12 aren't mapped to ALT, I'd prefer fn but ALT will do

I guess xev and xkbcomp or xmodmap might be used for this. The keyboard has a fn+Lock but it's not working (at least on my Xubuntu 18.04) -- and even if it did, I suspect it would lock on multimedia functions, which are also on the same keys

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