[SOLVED] Add APL Keyboard Layout On Linux 20.04

Add APL Keyboard Layout On Linux 20.04

I would like to start coding in the APL programming language. But for that, I need the right keyboard layout!

Here is the list of behaviors I'm looking for:

can be used with other layouts (us, fr...)
layout is swapable with the normal shortcut Super + Space
ideally can be managed with the native Ubuntu "Region & Language" GUI interface

I already found other StackOverflow answers like this one: APL Keymapping on Linux (GNU APL)

But what happens is that my french keyboard is being replaced with the APL one!

I also found sources saying that I should be able to add it natively with the Ubuntu: https://www.sacrideo.us/configuring-your-apl-keyboard-on-linux/

But I couldn't find it in the language and input: APL missing from Ubuntu region and language input source

Thank you for your help!

Solution

According to the documentation[1], you can enable some "rarely used keyboard layout variants", using the following command:

gsettings set org.gnome.desktop.input-sources show-all-sources true

Then you can add an APL layout (under English).

Edit: you may want to check https://aplwiki.com/wiki/Typing_glyphs_on_Linux , in particular in Gnome, using the Gnome Tweaks trick I set 'Right Ctrl (while pressed)', which does not require to switch layouts every time you type a special char. Ideally there should be a US APL layout (like in Windows?) and use the AltGr key; but apparently that doesn't exist yet (at least by default).