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I set up my keyboard to have a "compose" key on my Ubuntu 21.04 system. I love the flexibility! When exploring (System Settings-Hardware-Input Devices-Keyboard-Advanced), I discovered the Layout of numeric keypad selection. There are options there like ATM/phone-style, Hexadecimal, Unicode additions, etc.

I am very interested in both the Hexadecimal and the Unicode additions... However, I have not been able to find the layout mapping in order to choose whether to have a new keypad layout or leave it alone.

Where does one find the reference material for this feature?

UPDATE I am reviewing this questin (How to set up a custom keyboard layout?) and its answer. While not exactly the same question, they are related. If I glean a solution while perusing that question, I'll post it here.

TheGeeko61
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Those are XKB options. I'm not aware of any related documentation, but you can always explore the files under the /usr/share/X11/xkb directory.

Gunnar Hjalmarsson
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  • I'll try that out... So, there is no official documentation about keyboard management? – TheGeeko61 Jul 29 '21 at 19:46
  • It is like reading a Martian document... I see no explanation for why things are the way they are and, thus, without specialized knowledge unavailable to me. – TheGeeko61 Jul 29 '21 at 20:05
  • @TheGeeko61: I can't tell for sure that there is no relevant documentation; just saying that I'm not aware of any. If I was you I would simply try those options out and see what happens. – Gunnar Hjalmarsson Jul 29 '21 at 21:11
  • @Ginnar: that's exactly what I did which is why I said it was like reading Martian documents. :) Sure, one could spend weeks tearing those documents apart in order to see what patterns might emerge and be useful. – TheGeeko61 Jul 29 '21 at 22:48
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    @TheGeeko61: I think you misunderstood my last sentence. What I meant was trying the options out from the KDE gui (you are on Kubuntu, right?) and study the effects. – Gunnar Hjalmarsson Jul 29 '21 at 22:58