[TUTORIAL] Fixing UEFI boot

nak

New Member
Apr 15, 2021
4
5
3
I recently installed Proxmox VE on a server that was set to boot in BIOS/legacy mode, not UEFI. I later ran into the bug in grub where grub is really picky about what features are enabled in ZFS and will refuse to boot if certain features are enabled (large_dnode in my case). So I decided to switch the server to boot using UEFI but it dropped me to the UEFI shell.

It looks like although the Proxmox installer creates the UEFI partition, it does not properly create the boot entry if it is installed in BIOS/legacy mode (with grub).

So here are my notes on how I fixed this, hopefully this can help someone else:

On my system, at the UEFI prompt I entered:

fs0:\EFI\systemd\systemd-bootx64.efi

in order to boot the system as a one-time thing.

Once the system was booted I did fdisk -l and found that /dev/sda2 was my EFI partition. I also did efibootmgr -v and found that only the EFI shell was setup. So to fix this I ran (making sure /dev/sda2 is the proper EFI partition)

Code:
pve-efiboot-tool init /dev/sda2
pve-efiboot-tool refresh

Now I ran efibootmgr -v and found that there was an entry for Proxmox in the list.

Reboot and it should work.

See https://pve.proxmox.com/wiki/Host_Bootloader#sysboot_systemd_boot for more info.
 

genesis1

Member
Feb 3, 2022
99
3
8
I tried this to see if it would fix my non booting problem..... sadly didn't work for me.
 

Tim Hörnle - UJAM

New Member
Jul 26, 2021
9
0
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So here are my notes on how I fixed this, hopefully this can help someone else:

On my system, at the UEFI prompt I entered:

fs0:\EFI\systemd\systemd-bootx64.efi

I got the same case but I got not EFI partition present. Any advice what I can do in that case?
 

Dunuin

Famous Member
Jun 30, 2020
7,212
1,719
149
Germany
Proxmox-boot-tool wants a 512MB ESP partition for systemd boot. So maybe you can shink an existing partition to get some unallocated space to create a new 512MB ESP partition. Also thought about switching from grub to systemd boot but I only got a free 300MB partition I reserved back then for the ESP. :(
 

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