I just installed standard Ubuntu 20.04.3 LTS as a second OS in my old PC, and can't seem to make the keyboard to work as expected.
Whenever I press the [ctrl-L] [win] [alt] [alt-gr] [ctrl-R] or [shift-R] the system thinks I'm pressing [shift-L].
Therefore I can't use most keyboard shortcuts, and since it's a Spanish keyboard I can't even type some characters such as @ that require a combination with [alt-gr].
It's not the keyboard layout. I know I'm using the right one, the "eye" icon in Settings > Region & Language shows a distribution that matches what's actually printed on the keys. (That window actually helped me pinpoint the key subtitutions I'm getting). I tried changing it anyway, only to check that the problem remains.
The problem was not present when I tried plugging another keyboard. So I believe it must be something about the keyboard itself. I know it's not broken because it works in windows. Perhaps a driver or something.
The keyboard brand and model is: Noga, NKB-380A
