Thanks, sadly I had no luck again. The Linux version has the same behaviour as before. I searched a bit for Linux specific problems with RMMV and found this thread: https://www.reddit.com/r/RPGMaker/comments/dj3fnw/linux_problem/
So I downloaded the current version of nw.js, and indeed that got rid of the Fontconfig problems. However, in the window that opens I can only read "Failed to load: js/plugins/Community_Basic.js". Tried the Windows version in Wine again, also no luck, but it seems the messages are different. I can make out "Press F5 to restart the game", but that didn't help. 
Updating that version with the appropriate nw.js package made it worse since I didn't even get those messages.
wow! i swear my friend has been playtesting it for me, im a little turned around well!
my friend has playtested these setup on pc, i think it is probably an issue of the javascripts running in linux or through wine in linux, if that makes sense?
i am asking him to playtest it again
I don't think it will run in linux or wine for now, or even remote desktop. The javascripts and the way it is using graphics etc. does not seem to work yet. I think if I eliminated the light plugin and a few other things it'd work, but then the visual appeal would be reduced significantly. In a next game I will consider these posts when trying to make it more linux compatible. Thanks for commenting
