Well, I am also on linux (pop os) I just copy the .sh file from the demo to the new chapter. Then, when an error appear, it tells me which file I need to copy and where from the demo. I did that since linux support stopped. i just hope the dev does not change renpy version. xD
I don't know. I did not exchange words with the dev so I am not sure if it is because it cause problem on his end or he is not aware there are Artemis linux players.
I just hope I can continue to paste over the renpy files for linux and that it will still work in the futur.