When shutting down Finnix Rescue Disk (using power button), I got the following message:

Please remove the live-medium, close the tray (if any) and press ENTER to continue:

Well, if I don't use power button, I can just trigger poweroff -f , where the -f option to force the rescue disk to shutdown, this will shutdown the OS without the above interactive message.

But using the power button it will not shutdown