Comment 14 for bug 1673564

Once the build is complete, you'll be able to install it with:

sudo apt-add-repository ppa:yarmouth-team/thunderx
sudo apt update
sudo apt install linux-image-extra-4.8.0-49-generic=4.8.0-49.52~16.04.1+lp1673564.1

The PPA web page is at:
  https://launchpad.net/~yarmouth-team/+archive/ubuntu/thunderx