I'd like to add a custom keyboard layout in Linux Mint. The layout I'm trying to add can be found at this website.
However, I can't seem to find where the layouts are stored and google-searching (and the instructions from the website) only leads me to folders and files that do not exist in Linux Mint, or at least my version of it (should be the standard one).
So, my question is basically, how do I add a custom keyboard layout in Linux Mint? To clear things up: I want to add/install a NEW custom keyboard layout, not add/select one from the already installed ones.