xrandr – Cannot change resolution on LXDE

I have Ubuntu 18.04 with LXDE at Nvidia Jetson Nano small computer and when monitor isnt attached I’m stuck with 640×480 resolution.
Launching Preferences–>”Monitor Settings” does not result with anything appearing on screen and “lxrandr” from terminal returns “Segmentation fault”.

I then tried manually to add resolution 1280×768 but keep getting “cannot find output “S-video” or when changing mode to HDMI-0 getting “cannot find mode 1280×768” (see screenshot).

What could I do to change resolution? I’m accessing the device through NoMachine.

Screenshot of attempts

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