I have installed Unity 3D in my Ubuntu 18. But editor windows are filled with pink color. Only options like file, Accessories are visible.
In top of the Unity window OpenGL 4.2 is shown. So I checked my OpenGL version and it is 3.0. Mesa version is 18.x something. I followed many tutorials and ppa given online to update my driver and OpenGL. But still OpenGL version is 3.0.
I'm using Intel Atom Baytrail Z3735f Device.
Have same problem with Intel HD 4000 and OpenGL 4.2 (Core Profile) Mesa 18.3.6 trying to run Unity3D 2019.3.0a2 and 2019.2.0b2 under Debian.
Found the problem on Unity3D forum: https://forum.unity.com/threads/everything-pink-in-unity-2019-1-0f2-linux-editor-except-menu-bar.663277/
Intel HD 4000 specific issue and they won't fix it (there is quote from support in the post). Based on posts, works with Unity3D 2018.X but not 2019.X . Also should work under Windows.
Unity3D 2018.4.0f1 is markes as LTS (Long Term Support) so I would need to stick with it until I get newer machine (and recommend you to do the same). Working with integrated graphics is not good (especially with one which does not support 4K like mine).
We Can Use Other Version of OpenGL using -force-glcoreXY terminal command (XY is OpenGL version). Using OpenGL 3.2 Solved my issue by running -force-glcore32
Using Vulkan instead of OpenGL is a solution (-force-vulkan).
https://www.reddit.com/r/Unity3D/comments/bt8a0r/is_there_any_way_to_force_unity_to_use_vulkan/