Qt: XKEYBOARD extension not present on the X Server

This is a bit complicated and highly specific case so I will try with a high level description and if necessary delve deeper. My purpose is to run ROS (Robot Operating System) on a Digital Ocean node so that I don’t have to set it up on my Mac (anyway, it won’t run properly on a Mac.)

I’m running Ubuntu 18.04 on the Digital Ocean node. There I am running xfce4 and tightvncserver.

On my mac, I am creating the tunnel to the above server with this command:

ssh -L 5901: -C -N -l <myname> <myip>

On my Mac I then use vncviewer to connect to the Digital Ocean Server, and that seems to work fine.

When I launch the most basic ROS simulator, which normally would open a graphical window if I was running on a native ubuntu box I get this error:

enter image description here

Any thoughts on what is broken and how to fix it?


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