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I've searched for this question in vain. Does anyone know why the Fn key can't be assigned? The OS accepts all keys(even the keys that are set as shortcut by default, can be changed). What makes the Fn key different from other keys? Is there a way to change this behavior and use it for shortcuts?

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    AFAIK, most laptops don't actually send fn keypresses to the OS - i.e Ubuntu doesn't know it exists as an individual key - the only key events that the OS does get is when the fn key is pressed together with other keys, such as volume, brightness, etc., and those are seen as a single keypress event. You can test this with xev in a terminal (assuming you're using xorg and not wayland) - fn on it's own doesn't generate an event. It's just a way for laptop manufacturers to cram more stuff & features onto a single key. – Jonas Czech Jul 22 '19 at 18:49
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    Make that an answer so that we can upvote it... – xenoid Jul 22 '19 at 20:16
  • @JonasCz Make that an answer so that we can upvote it... – mchid Jul 23 '19 at 04:31
  • @xenoid Hi, you can use @ at the beginning of a comment to address a certain user so that the comment will show in their notifications. Otherwise, the other user may never know that you have commented. – mchid Jul 23 '19 at 04:33

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