Can't find libGLX_nvidia.so.0 after Nvidia 440 driver is installed

Hello,

My system is Ubuntu 16.04 and my graphic car is GTX 1660ti. I installed Nvidia driver 440 and it seems working. But when I install the vulkan SDK it reports can’t find the file “libGLX_nvidia.so.0”. I search my computer and can’t find this file. Should this file be created by Nvidia driver? Or I should install any other driver?

Thanks,
Simon