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I'm trying to install Proxmox on a new machine (GMKteck NucBox M5 Pro Mini PC) but keep getting the following error :

EFI boot mode detected, mounting efivars filesystem mount: /sys/firmware/efi/efivars: mount(2) system call failed: Operation not supported.

dmesg(1) may have more information after failed mount system call.

Installation aborted - unable to continue (type exit or CTRL-D to reboot)

I've also tried installing Ubuntu and Arch Linux and they both fail with a very similar error.

The bios seems to have no option for legacy boot so it's booting in UEFI mode by default.

Any help would be appreciated.

proxmox install screenshot

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  • Do you have other OS installed (e.g.Windows) or has the drive been used before? Hoe did you made the installation media?
    – ChanganAuto
    Commented Feb 7 at 14:47
  • No, just an empty NVME drive (it used to contain windows but all partitions have been wiped), trying to install from USB media, flashed with Etcher, Rufus and Ventoy (tried all, same result)
    – mrsmith
    Commented Feb 7 at 14:51
  • And you say you tried different ISOs? Are you sure they aren't corrupt?
    – ChanganAuto
    Commented Feb 7 at 14:54
  • No the ISO is fine, I've tried it on another machine without issue.
    – mrsmith
    Commented Feb 7 at 14:55
  • Let's try one thing (that shouldn't matter but maybe it does): Boot a live session (e.g. Ubuntu) instead of going directly to the installer, open GParted, select the target drive, then at the Device menu select Create new partition table..., choose "GPT". And perhaps it's a good idea to check other UEFI settings like drive mode and make sure it's AHCI. This is because "fake RAID" modes or Intel RST (not applicable here) aren't really supported yet in Linux.
    – ChanganAuto
    Commented Feb 7 at 14:58

1 Answer 1

Reset to default
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I ran into the same issue, and found an answer on the following page: https://www.virtualizationhowto.com/2024/02/gmktec-m5-mini-pc-review-as-home-server/

In the BIOS menu under "CPU Configuration" > "Advanced" enable NX-mode.

This did the trick for me.

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