Graphics Issue: GSL Link Error

Code (CSharp):

1. -------- GLSL link error: TES compile failed: no register to spill
2. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)

i receive that red error like 20 times.
so, basically, i keep getting this issue, whenever my project starts (in linear color space).
and to be frank, the scene, just looks wrong, (too dark).
and the editor itself, also looks too dark (and no, not dark theme type of dark, but, wrong white type of dark )



if anyone, can lend me a hand fixing this, i'd be thankful
also, i am using linux mint 19.1
unity 2018.3.4f1

extra note: there were, small amount of times, when i opened the project, and it worked fine, but most of the times, this issue just pops up.