To reallocate RAM to "Minecraft," you'll have to edit the game's settings through whatever launcher app you use.
If you need to run Windows apps on Linux, Winboat is inching ever-closer to full release and will make your life considerably easier.
Winboat is a new technology to run Windows apps on Linux. The app is currently in beta, but shows real promise. If the developers can deliver, this will be a game changer. Also: I've used Linux for 30 ...
Java Edition," you'll first need to download a free program called OptiFine.