On Ubuntu, the launcher incorrectly installs openjdk 11, which does not allow the game to run.

When I load up the game it instantly crashes. I removed openjdk 11 and installed openjdk 8. When reinstalling the game (as this deleted the game as a result) it automatically reset my JDK version to 11, which reset me to square 1. So then I set the Java runtime directory through the launcher, and once launching the game it says that it cannot locate the java runtime, and under exists, it says directory, which I have never seen before. This is not my main computer and I was going to try and test my modpack on it, but with the base game not launching, it's impossible. Also note that the stock game runs fine on my other computer running stock Ubuntu, so it might just be a budgie thing, but even on that computer I had to uninstall OpenJDK 11 which had auto installed with the launcher, but I could remove it on that one.