We are turning around in circles here. All these problems have been solved many times over here on this forum.

It is usually a simple matter of just editing the config.txt file in the boot section of the Pi4.

Also, x11VNC works just fine. Couldn't be more straightforward.

Set the framebuffer to the size of your monitor in the config.txt file

set the hdmi_hotplug and the hdmi_mode (82 in my case for 1920x1080)

set x11vnc -storepasswd

add x11vnc -usepw -shared -forever to the Ubuntu Startup Items

That should do it.

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