<![CDATA[Linux VM (Ubuntu 22.04) - Grub-Menu invisible]]>Hi!

I am having a problem with linux VMs, that are not showing grub.
The console of the VM is black until the VM does really start.

What I tried:

Changed grub-config to:

GRUB_TIMEOUT=5
GRUB_TERMINAL=console

and

GRUB_TERMINAL="serial"
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200"
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"

Can you give me a hint on how to solve this?

Best wishes

]]>https://xcp-ng.org/forum/topic/11125/linux-vm-ubuntu-22.04-grub-menu-invisibleRSS for NodeFri, 15 May 2026 07:50:14 GMTFri, 01 Aug 2025 06:41:08 GMT60<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 13:36:24 GMT]]>@KPS Glad to hear 🙂

]]>https://xcp-ng.org/forum/post/95904https://xcp-ng.org/forum/post/95904Fri, 01 Aug 2025 13:36:24 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 12:26:48 GMT]]>@GuillaumeHullin
That was the trick!

GRUB_TIMEOUT_STYLE="menu" did solve it!

]]>https://xcp-ng.org/forum/post/95903https://xcp-ng.org/forum/post/95903Fri, 01 Aug 2025 12:26:48 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 12:10:51 GMT]]>@KPS said in Linux VM (Ubuntu 22.04) - Grub-Menu invisible:

GRUB_TIMEOUT_STYLE

Set it to menu

If ‘GRUB_TIMEOUT_STYLE’ is set to ‘countdown’ or ‘hidden’, the timeout is instead counted before the menu is displayed.
Source: https://www.gnu.org/software/grub/manual/grub/html_node/Simple-configuration.html

]]>https://xcp-ng.org/forum/post/95902https://xcp-ng.org/forum/post/95902Fri, 01 Aug 2025 12:10:51 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 11:57:13 GMT]]>@KPS Are you geographically separated from your XCP-ng hosts? I've noticed from time to time due to internet latency that I don't always see the grub menu.

]]>https://xcp-ng.org/forum/post/95901https://xcp-ng.org/forum/post/95901Fri, 01 Aug 2025 11:57:13 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 11:57:04 GMT]]>@GuillaumeHullin said in Linux VM (Ubuntu 22.04) - Grub-Menu invisible:

GRUB_TIMEOUT_STYLE

I did change GRUB_TIMEOUT_STYLE from "hidden" to "timeout".
Now, the system is counting down from 5 to 1 (on a screen, where the rest is black), but the menu is still missing

]]>https://xcp-ng.org/forum/post/95900https://xcp-ng.org/forum/post/95900Fri, 01 Aug 2025 11:57:04 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 11:50:22 GMT]]>@GuillaumeHullin
This was just something, I found while googeling...
I did use your config, but still:

  • Black screen instead of the boot-menu.
]]>https://xcp-ng.org/forum/post/95899https://xcp-ng.org/forum/post/95899Fri, 01 Aug 2025 11:50:22 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 11:30:19 GMT]]>I'm not sure to why you are setting up serial connection?

@KPS said in Linux VM (Ubuntu 22.04) - Grub-Menu invisible:

GRUB_TERMINAL="serial"
GRUB_CMDLINE_LINUX="console=tty0 console=ttyS0,115200"
GRUB_SERIAL_COMMAND="serial --speed=115200 --unit=0 --word=8 --parity=no --stop=1"

I'm pretty new on XCP-ng... but I'm pretty sure the "console" of a VM is not a "serial console".

FYI, this is my /etc/default/grub

GRUB_DEFAULT=0
GRUB_TIMEOUT=5
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
GRUB_CMDLINE_LINUX=""
]]>https://xcp-ng.org/forum/post/95898https://xcp-ng.org/forum/post/95898Fri, 01 Aug 2025 11:30:19 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 11:16:07 GMT]]>2 ideas:

  • What is the value of GRUB_TIMEOUT_STYLE?
  • Do you have a GPU connected? it's a shot in the dark but I got this kind of issue because of GPU drivers... but on bare-metal machines 😉
]]>https://xcp-ng.org/forum/post/95897https://xcp-ng.org/forum/post/95897Fri, 01 Aug 2025 11:16:07 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 11:01:07 GMT]]>@GuillaumeHullin said in Linux VM (Ubuntu 22.04) - Grub-Menu invisible:

Hi,
Have you run sudo update-grub after changing your configuration?

Yes, I did

]]>https://xcp-ng.org/forum/post/95896https://xcp-ng.org/forum/post/95896Fri, 01 Aug 2025 11:01:07 GMT<![CDATA[Reply to Linux VM (Ubuntu 22.04) - Grub-Menu invisible on Fri, 01 Aug 2025 10:58:22 GMT]]>Hi,
Have you run sudo update-grub after changing your configuration?

]]>https://xcp-ng.org/forum/post/95895https://xcp-ng.org/forum/post/95895Fri, 01 Aug 2025 10:58:22 GMT