4.18.1 skylight not working

Fresh Install of UE4 with simple 3rd person example map. Trying out linux version of engine figured out that skylight not working. I have opened my own project with configured lighting and there the same thing - skylight not working.
How to fix this?

Ubuntu 16.04.3
fresh amdgpu-pro driver

Got the same problem in 4.21, Win10 x64, Nvidia GTX 1060

tengo el mismo problema, alguna solución?