Hello, Brett is no longer with LunarG and I'll be making updates to his ITP bug submissions about the status of these packages.
The current status for the shaderc package is that it has been out for 1+ years now and is hosted by LunarG. I am LunarG's curator for these packages, please check https://vulkan.lunarg.com/sdk/home under the "ubuntu packages" tab for more information about our repository.
