I just installed unreal engine 4 on ubuntu, so i am not 100% sure I installed everything correctly, but if you can find the problem then great!
Here is my problem:
Nothing in the viewport, including the grid, is visible. When I run the game, nothing is visible. Just a blue / gray background. New projects all have the same issue, as well as re-opening projects and restarting my computer and unreal. I don’t think I touched anything that would effect the visibility of everything, but if you have an idea that would help a ton.