[VirtualGL-Users] Dual GTX 1080i headless server issues

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Hi All,
I have setup a headless server with 2 - Nvidia GTX 1080i video cards  
using Linux Mint 18.1 as the OS. I am using the Nvidia 384.59 drivers.
Output from nvidia-xconfig --query-gpu-info:
Number of GPUs: 2

GPU #0:
   Name      : GeForce GTX 1080 Ti
   UUID      : GPU-cc7afa9d-a61d-950a-0f45-511bd6f1f340
   PCI BusID : PCI:4:0:0

   Number of Display Devices: 0


GPU #1:
   Name      : GeForce GTX 1080 Ti
   UUID      : GPU-def710e8-b54f-d87d-be43-538d7395c0d8
   PCI BusID : PCI:65:0:0

   Number of Display Devices: 0

Pertinent output from lspci:
04:00.0 VGA compatible controller: NVIDIA Corporation Device 1b06 (rev a1)
41:00.0 VGA compatible controller: NVIDIA Corporation Device 1b06 (rev a1)

I am using the default mdm display manager (comes stock with linux mint)
When I plug a monitor into the computer directly all video functions  
work correctly (glxgears, glxinfo, etc..)

I setup the vncserver and then use the vncviewer to connect to the  
headless server. When I try to execute vglrun glxgears I get the error:
[VGL] ERROR: Could not open display :0.
I have ran the vglserver_config script with stopping the following  
modules: nvidia_drm, nvidia_uvm, nvidia_modeset, and nvidia. I also  
stopped the killed the nvidia persistence process prior to the setup  
along with mdm. The config seemed to complete perfectly and I have  
restarted the computer.

I appreciate any further advice with this issue.
Thank you,

Marshall Stageberg
Michigan State University