Comment 2 for bug 1866407

The issue I found is that the walinuxagent Extension installs the 16.04 cuda drivers on Ubuntu 18.04. The issue here is the driver has changed a bit with the inclusion of libglx-mesa0 in Ubuntu 18.04, where it was not previously in 16.04.

This causes the failure to install nvidia-driver-* package. It should have the "/usr/lib/x86_64-linux-gnu/libGLX_indirect.so.0" library in the nvidia-driver-* package for 16.04, but not for 18.04 since this is already included in the libglx-mesa0 package.

If you install the 18.04 Nvidia drivers, using the following instructions, it will succeed:
https://developer.nvidia.com/cuda-downloads?target_os=Linux&target_arch=x86_64&target_distro=Ubuntu&target_version=1804&target_type=debnetwork