I was trying to use Unity's shader graph which leads me down the path of needing to convert to lightweight render pipeline. When I did I found everything is now pink, not just one or two assets like everything in the scene but the terrain. I have tried a few things that have been suggested such as changing to a pipeline asset in graphics and reimporting all but no luck.
It did ask me if I wanted to convert to LWRP materials and I said yes for the project. I can't imagine everyone rewrites every single one of their legacy shaders into LWRP or just throws them all out to only use new assets that are lwrp compatible. Even fairly basic particle effects are purple, I also tried adding all the built-in pipeline shaders in the include section.
Also, most of the docs I am reading keep saying go to create < rendering pipeline < LWRP but I don't see that as an option I see Universal Rendering pipeline instead.