Is there a GUI for remapping the keyboard in Ubuntu 20.04 LTS?
Solution 1:
You may be intersted in the Kay-mapper gui
https://www.linuxuprising.com/2020/12/remap-keyboard-and-mouse-buttons-on.html
Solution 2:
It sounds to me as if you want to explore Tweaks -> Keyboard & Mouse -> Additional Layout Options.
To get an overview of available XKB options, you may want to run
man xkeyboard-config
and scroll downwards to OPTIONS.