Why does the Unreal Engine in Ubuntu Just don't work?

I have been using Unreal Engine in Ubuntu 24.04 for a project with ROS2 integration. the most frustrating part about working with unreal in Ubuntu is, so many non working components. I have built the engine from source (5.7, 5.3, 5.4, 5.5) and none of them have a working Fab. I mean the whole idea of using unreal is to utilize the assets from FAB to create something real life like. but if the plugin itself wont work, what should we do? i have tried so many things. And if anyone knows how to make this work, please help me on this.

i have tried to add the plugin just for the project, tried editing the fab plugin files, it just won’t budge.

if any developers are reading this, please take a look into this issue.