Confirm demos work (with GPU) on AWS

[gjstein]

One of the things I would very much like to confirm is that I can get this repository and its demos working on a headless server on the cloud (assuming the machine has an NVIDIA GPU).

From experience, I believe that it will be necessary to get Ubuntu running the desktop version (or at a minimum lightdm) before this will work, since it seems like something xvfb requires.

[gjstein]

Here are my notes from the last time I tried getting this to work. In short, I managed to get something working (including Unity) but at the time I was using TensorFlow, which was unhappy for some unknown reason.

I first installed the following packages :

sudo apt install x11-xserver-utils xinit xterm xorg
xhost +local:root

This seemed to help: https://virtualgl.org/Documentation/HeadlessNV

I also installed ubuntu-desktop and I have no idea if that did anything, but it seems that gdm was running when I booted up the machine. Running sudo service gdm stop and then sudo startx & powered up the X server. It seemed that I could then run the Unity environment.

[gjstein]

Update: PR #7 adds CPU support and enables the Continuous Integration pipeline for a CPU-only workflow. I have added (with GPU) to the title, to reflect that the CPU-in-the-cloud tests are now confirmed to work.