A04 potential X performance problems + potential solution

[poulsbo]

@annathyst

sudo apt-add-repository ppa:aglasgall/devterm-a04-xorg

I had to follow these instructions to get this to work: 18.04 - sudo add-apt-repository hangs - Ask Ubuntu

After adding the repository and running sudo apt update && sudo apt upgrade, my log no longer shows the GLX error.