Hi, I dont know so much about unreal engine in Ubuntu, You tried to solve this with post process volume?, or what you whant is to know the origin of your problem in ubuntu?
Nope, it just has a lot of bloom by default for some reason, and yes, I’m trying to figure out what the origin of the error in Ubuntu is. the materials are identical in every way to the other ones used in Windows. They have just rendered way differently.
If the settings are the same in engine only thing I can think of is possible video driver issue or something really messing with the renderer in the Linux Distro.