Bug Unity Labs Sample Project Light Build Error

I have downloaded the Unity Labs sample project and I am unable to properly build the lighting. It is currently set to auto build, but it stops at step 7. I get the following error at step 7 of light build:

Failed executing external process for 'Light Transport' job.

I have not modified anything. I simply downloaded the sample project into a clean project and imported it and was waiting for the light build.

Anyone else getting the same error?

I'm running Unity 3d for Linux on Ubuntu 15.10. This is the first time I have got any error or bugs since using the latest build of Unity for Linux now for about a month. I look forward for a more stable release. Thank you to the Unity team for such a great release.

 

little pity ,I got the same puzzle.maybe this is the internal bug in unity.I couldn't fund the solution too.