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@Tahoeob you don't seem to understand the issue here. ProjectLibre is indeed incompatible with modern Java releases. This is not a problem for Windows and MacOS, as ProjectLibre is bundled with an old Java release for these OSes. But it is a problem for Linux, as it is getting more and more complicated to install an old Java release on a recent OS. Benjamin succeeded in running this on ArchLinux, but I failed with Ubuntu.

Well I tried something like this, except the paths are not the same on Ubuntu, but I couldn't get it to run. I also tried altering the JAVA_HOME environment variable, to no avail, then I got fed up and stopped trying.

Maybe you didn't read the bug report, as it clearly states that this software does not work with Arch Linux. I can confirm that it does not work with a recent Ubuntu release (21.10) either. Most buttons have no effect, like task insert, delete, indent, outdent. I even tried with both openjdk-11-jdk and Oracle Java 11 and setting them to be the default java version, but the result is the same. The only thing I didn't try is uninstalling Java 17, as this would mess with other, up-to-date software.