This message was posted on behalf of Intel Corporation
I understand you are having troubles installing Ubuntu 16.04 on your Intel® NUC NUC6CAYH.
Let me apologize for any inconvenience this issue may be causing to you.
What happens is that support for Linux* operating systems is provided by the Linux* Community directly. I recommend contacting Ubuntu* directly so they can make sure the specific operating system version you are installing is compatible with the Intel® NUC NUC6CAYH.
The Linux* Community should be able to help you making sure the issue is not being caused by the operating system image on the USB drive.
This link will give you their contact information http://community.ubuntu.com/
This link will give you more information about Supported Operating Systems for Intel® NUC Products https://www.intel.com/content/www/us/en/support/boards-and-kits/intel-nuc-boards/000005628.html