Loading the Unity Editor yields a completely pink editor window. Attempting to create a standard cube or sphere gives a completely black object.
This is on Fedora 22 with the latest nVidia drivers installed through RPMFusion.
Pursing the log seemed to indicate that the UnityShaderCompiler requires 32bit video drivers as well. Installing them solved the issue.
Funny that… 
Wait hang on, 32-bit device drivers work on 64-bit linux?!
sure sign that UT have a lot of work to do before it’s ready. 
Also a sign that 32-bit won’t be vanishing anytime soon, for software reasons!
Yes, some of the tools are still 32-bit / require 32-bit libraries (on all OSs).
But then again, you don’t need to install 32-bit device drivers for windows to use it, that was more my point.
This may obviously be fixed by you guys anyway though.