Comment 21 for bug 1752938

I encountered same problem, and I found the work around.

I believe this was because libglx from xorg over-written the one from amd/nvidia.

For people using nvidia graphic cards, you can do:

sudo mv /usr/lib/xorg/modules/extensions/libglx.so /usr/lib/xorg/modules/extensions/libglx.so.bac
sudo ln -s /usr/lib/nvidia-396/xorg/libglx.so /usr/lib/xorg/modules/extensions/libglx.so
Then restart.

I belive amd users can do the similar thing.

reference: https://devtalk.nvidia.com/default/topic/830711/linux/failed-to-initialize-the-glx-module-please-check-in-your-x-log-file-that-the-glx-module-has-been-lo/