Installation failed - Bootloader setup error

[Penchev]

Hello, this is my first post. Complete noob in proxmox I bought a Lenovo M43 Tiny pc to run my home automation but I failed on the first step: installing proxmox

I tried searching for a solution but didnt find it...

I tried removing all bootable options as it was suggested on other threats

Thank you!!

 

[fschauer]

To figure out what causes the grub-install to fail you can press Ctrl + Alt + F2 to switch to a tty showing the logs. This should show a more detailed error message.

Alternatively you could just go to the BIOS settings and switch from EFI boot to legacy BIOS boot and install it that way.

 

[kvamsi.k143]

Please use this thread that worked for me.

P

[SOLVED] Post in thread 'Cannot install PVE as UEFI OS'

Jun 29, 2025

Well, the thread is solved, but nothing helped me so far from here, neither from another thread, so LMTry and sum it up nicely what I had to do.

Mr. LLM model tells me it's a UEFI firmware bug which i can neither deny or confirm, but it's, well, sad...
For the sake, I'm using a Lenovo Thinkcentre M70q Gen.5 with freshest avail BIOS framework (26 Jun 2025).

Anyways, let's not waste time here:
1. Install proxmox from a bootable device (like USB, via Rufus)
2. Get the error message of failed to prepare EFI boot using Grub on '/dev/sda2': unable to install the EFI boot loader...

• pvemexer

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