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If no image is displayed, switch to another terminal by using the key combination Ctrl + Alt + F1, Ctrl + Alt + F2, etc. Proceed as follows:

• Ctrl-Alt-F2 (2nd terminal): Check Xorg error
• Ctrl-Alt-F3 (3rd terminal): Configure /usr/share/X11/xorg.conf.d/ driver-nvidia.conf
• Ctrl-Alt-F1 (1st terminal / installer): $ xinit

On one of the terminals you may see an error message such as “Cannot connect to X server: Resource temporarily unavailable”.

• Create a driver description file under /usr/share/X11/xorg.conf.d/driver-nvidia.conf with the following content:

Section “Device” 
    Identifier “Card0” 
    Driver “fbdev” 
    BusID “pci0:01:0:0:” 
EndSection

• Execute the command:

xinit -- -dpi 96 >/dev/tty2 2>&1

The installation process should now begin and be visible on the monitor.

If you follow these steps, you can solve the black screen problem and successfully install Proxmox on your system.