You should definitely use VirtualGL 2.6.5, since Ubuntu 20.04 is not supported with VirtualGL 2.5.x.  Did you re-run vglserver_config after installing VirtualGL 2.6.5?

On 6/8/21 1:55 PM, Emanuel wrote:

I need some help with how to resolve the vglserver_config/vglrun  issue below.

Installing VirtualGL 2.5.1 on Ubuntu 20.04 has been problematic. I have tried VirtualGL 2.6.5 as well on Ubuntu 20.04 but no luck.

VirtualGL 2.5.1 install on Ubuntu 18.04 works.

 A reboot after running vglserver_config on Ubuntu 20.04 results in a blank screen with a blinking cursor; system comes back up on the network however - which allows me to run the vglrun command.

server:opt/apps/tigervnc/1.10.1/usr/bin$ vglrun glxgears

[VGL] ERROR: Could not open display :0.

server:/opt/apps/tigervnc/1.10.1/usr/bin$ lsb_release -a

No LSB modules are available.

Distributor ID: Ubuntu

Description:    Ubuntu 20.04.2 LTS

Release:        20.04

Codename:       focal

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