Legacy PC (ASUS X99-Deluxe) can't install Proxmox in UEFI mode

[ihr]

Hi,

I've at home 4 PCs running proxmox and a couple of virtual machines for testing purposes. One of them is based on an ASUS X99-Deluxe motherboard with an i7 processor, 12 CPUs and 64 Gb of RAM but the problem is that I've been unable to install proxmox if I enable UEFI. Here is where the process freezes:



This happens when booting from the USB after burning the latest installer. In BIOS I've set:

Secure boot: Disabled
OS Type: Windows UEFI mode (there are no other alternatives for UEFI)


Additional information:

When booting from grub, everything works fine
when booting from grub, efibootmgr -v says EFI variables are not supported on this system. I don't know if this is due to a bad implementation of UEFI in the motherboard or anything else.

Any help will be appreciated!

Regards
Ignacio

 

[ihr]

Hmm... trying to start Rescue Mode from the installer USB raises error: compression algorithm 44 not supportedI wonder why it is not supported? I just burned the latest installer for Proxmox version 8.3