Clean install OS start only with usb and grub rescue

[Jacopo1891]

Hello!
I did a clean install of the operating system but when I start the pc it can't find any bootable devices:

"no bootable device insert boot disk and press any key"

The system boots correctly only with the boot usb used for the installation and choosing "grub rescue".

Any ideas?

Attempts:
- Disabled uefi on boot
- Disabled secure boot options
- Install another parallel linux OS to manage boot (ubuntu installer do not see proxmox os)
- check bootable partition

 

[leesteken]

I did a clean install of the operating system but when I start the pc it can't find any bootable devices:

I'm assuming you mean Proxmox VE and not another operating system inside a VM?

The Proxmox installer only supports UEFI and not CSM (or legacy) boot mode. The official work-around currently is installing Debian (Bullseye) and Proxmox on top of it.

 

[Jacopo1891]

I'm assuming you mean Proxmox VE and not another operating system inside a VM?

Hi avw! i mean i installed Proxmox on the pc after a full format.

The Proxmox installer only supports UEFI and not CSM (or legacy) boot mode.

I did the installation with this setting enabled and OS did not start, after that I tried to disable it but it still not work.

I don't understand if it's a grub problem or something else.

 

[leesteken]

I think the issue is that the Proxmox installer creates a GPT on the drive. Systems that boot in UEFI mode and some systems that boot in CSM mode work fine. However, some older systems can only boot from a MBR, which is not supported by the Proxmox installer. There are some threads on this forum about converting GPT to MBR. Another work-around is to first install Debian GNU/Linux and then installing Proxmox from inside Debian.

 

[Jacopo1891]

I've checked and there is a GPT partition.
To fix the problem i have to convert the GPT partition to MBR (or UEFI)?

 

[Jacopo1891]

I've tried to convert GPT partition to MBR but now it's GPT and "MBR protective".
It still not start without usb.

I do not undestand what i'm missing.

 

[Jacopo1891]

UP
(Sorry but i can not find any working solution.)

 

[leesteken]

I've tried to convert GPT partition to MBR but now it's GPT and "MBR protective".

This is the same as just after installation, so you did not manage to change anything. Some people on this forum have has success in converting the GPT to MBR.
I believe that the "official" work-around it to install Debian and then install Proxmox on top of Debian,

 

[Jacopo1891]

I solved with a bit of luck:
- I converted the boot partition from GPT to GPT + MBR protective
- I formatted it and launched some commando of the proxmox tool for boot management and I don't know which one solved the problem.

proxmox-boot-tool init / dev / sda2
proxmox-boot-tool refresh
proxmox-auto-removal
pve-efiboot-tool refresh