Run VNC without connected monitor to ubuntu Desktop

ubuntu-vnc-without-monitor.md

Install Video Dummy Package

sudo apt-get install xserver-xorg-video-dummy

Create Default X Windows Configuration File

Create / Edit xorg.conf file Rename file if already exists for backup

sudo vi /usr/share/X11/xorg.conf.d/xorg.conf

Add the following content to the file Set the resolution to what you like (whatever resolution the screen is that is used to connect remotely is probably is a good idea)

Section "Device"
    Identifier  "Configured Video Device"
    Driver      "dummy"
EndSection

Section "Monitor"
    Identifier  "Configured Monitor"
    HorizSync 31.5-48.5
    VertRefresh 50-70
EndSection

Section "Screen"
    Identifier  "Default Screen"
    Monitor     "Configured Monitor"
    Device      "Configured Video Device"
    DefaultDepth 24
    SubSection "Display"
    Depth 24
    Modes "1920x1080"
    EndSubSection
EndSection

Save the file Reboot and Test

Thanks @Human0722! I was having headaches for days and almost bought a dummy HDMI plug on Aliexpress until I came across this thread!
So, it still works like a charm on the latest version of Ubuntu 25.04.