Re: [EXT]Re: Converted MBR to GPT and menu is gone, can't use grub-reboot either

[Pascal Hambourg]

On 21/02/2023 at 16:33, Chandler wrote:
> I set the TIMEOUT back to 5 and I see the blank screen for about 12
> seconds before seeing kernel messages.  I think you're on to something!
> It tells us the menu is showing /somewhere/ just not on any screen we
> can interact with.
(...)
> Since I am mainly using the Serial Over Lan, and rarely the Java or
> HTML5 iKVM, and even less the VGA port, GRUB_TERMINAL=console will
> hopefully take care of this... but not yet, still blank.  Let me see if
> the iKVM's show anything different...

If you want GRUB to use the serial port, you may try to set it in 
/etc/default/grub. According to the kernel parameters:

GRUB_SERIAL_COMMAND="serial --unit=1 --speed=115200"
GRUB_TERMINAL=serial