Sharing my experience of trying to get a Ubuntu 18.04 LTS host machine running reliably so I can interface with the Jetson Xavier.
My advice is do not try to install Ubuntu on a computer/host machine that has an NVIDIA GPU on it.
The Ubuntu 18.04 LTS runs much smoother on a machine that does not have an NVIDIA GPU on it.
For a solution to the NVIDIA GPU hardware error, check out https://cudaeducation.com/acpiexception/
Visit cudaeducation.com for more posts on Jetson Xavier, CUDA, TensorFlow etc.