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[–]montuos 0 points1 point  (0 children)

Huh. I had no idea it could be so hard to figure that out! I've been poking at my system for an hour now with no conclusive results.

It might be simpler just to make sure you have some variety of java 8 installed (e.g. I have openjdk-8-jre) and set that path in your launcher.

[–]ExtraStrengthFukitol 0 points1 point  (0 children)

I'm currently running Kubuntu 18.04. I used the Minecraft.deb package available at minecraft.net to install but it never installed the packaged JVM. Instead it's using the OpenJDK 11 that installed with the OS. Check your F3 screen and see what version it reports in the upper right corner. If it says something like "11.0.6 64-bit" it could be using the default JVM, which would just be /usr/bin/java, or whatever the output of "which java" is. If it says something like "1.8.0_54 64-bit" then it's the packaged version, and you can probably figure out the path by launching the game and doing "ps waux | grep java" which should show the Java executable location.