I'm afraid I'm not sure either, to be honest. I'm using RPG maker MV, which comes with the option to export to Linux, but it's pretty much untested. You can check the !zLINUX USERS PLEASE READ.txt file, and see if anything there helps. If you figure it out, please let me know and I'll add it to the file!
This is an outdated method and no longer works, nor should it really have worked in the first place; it was a bug, as far as my investigation has gotten me.
There should be other ways to run the game in the LINUX USERS PLEASE READ readme (I think that's what it's called, didn't check specificially for this comment), which shouldn't have this issue. Additionally, here's a copy of another comment I made about 2 months ago about this issue:
Hi! Whotooed here. You might know me from: the girl who discovered you can play this game by opening index.html in the www folder on linux.
I'm here today to tell you that you shouldn't, in fact, do that. The whole reason it works is because RPGMaker MV is sort-of, kind-of, a browser-based game engine, and opening index.html creates a local http server on your device that serves the files within www. To put it simply, it's a bug. And if you try to use it with another game (by, for example, opening the www folder in terminal and using the command "python3 -m http.server") then it might get stuck on Lust Doll Plus and make you unable to play either one properly without bugs when you use this method.
Trust me. I've lost my save data for both this game and also Violated Princess because of this.
Instead, please update nw.js manually to v0.45.6 using the method and link found in LINUX USERS PLEASE READ.txt (alternatively this link also works to find the download).
So, as another alternative method so that I can still maybe have the prestige of my name being mentioned in the LINUX USERS PLEASE READ.txt file, this is a very good piece of software I've found for playing RPGMaker games. Just make sure to set it to use v0.45.6 of nw.js by:
1. Downloading it with
wget -qO- "https://raw.githubusercontent.com/bakustarver/rpgmakermlinux-cicpoffs/main/installgithub.sh" | bash
2. Running
rpgmaker-linux --nwjsversion 0.45.6
to install nw.js 0.45.6 as part of its available versions.
3. Opening the windows version of Lust Doll Plus (the .exe) by right clicking and using the Options variant of it and setting it to run with v0.45.6.
4. Finally, you can use it with Lust Doll Plus by opening the .exe with the other variant of it (cicpoffs mount), or you can keep going through its options menu every time if you're a masochist, and like pressing F10 to turn off the cheats menu that opens in the top right.