Every few months a thread pops up on the Proxmox forums or r/homelab: "I've got a spare Raspberry Pi, can I turn it into a Proxmox box?" It's a reasonable question. Pi hardware is cheap, it sips power, and Proxmox VE is free. On paper it sounds like the perfect pairing.
It isn't, and the reason comes down to something more basic than software: the chip inside the Pi speaks a different instruction set than the one Proxmox VE is built for. That's not a bug or a missing feature you can enable in a settings menu. It's a hardware limitation, and understanding why will save you a wasted afternoon flashing SD cards.
This guide explains exactly why the official Proxmox VE ISO won't boot on a Raspberry Pi, how to check whether any given machine actually meets the requirement, and what homelab users do instead when they want Pi-like hardware costs with real virtualization.
What You Will Learn
- Why Proxmox VE requires a 64-bit x86 CPU and won't run on ARM boards like the Raspberry Pi
- How to check whether your own hardware (the machine you're actually planning to install on) supports virtualization
- What happens if you try to boot the Proxmox installer on unsupported hardware
- Realistic alternatives if you want Pi-cheap, Pi-small hardware for a homelab
- What you can still do with a Raspberry Pi if virtualization is the goal
What Is This Feature?
Proxmox VE is a bare-metal hypervisor. That means it installs directly onto a physical machine, in place of a normal desktop OS, and its whole job is to carve that machine's CPU, RAM, and disks up into multiple virtual machines and Linux containers. It's built on top of Debian, and it uses two virtualization technologies to do this: KVM for full virtual machines, and LXC for lightweight containers.
KVM (Kernel-based Virtual Machine) is the part that actually runs a guest operating system as if it had its own real hardware. For KVM to be fast rather than painfully slow, it leans on virtualization extensions built into the CPU itself: Intel calls theirs VT-x, AMD calls theirs AMD-V. Those extensions only exist on 64-bit x86 processors — the Intel Core, Xeon, and AMD Ryzen and EPYC families. They do not exist on the ARM chips found in Raspberry Pi boards, phones, or most ARM-based single-board computers.
Proxmox also, as a project, simply doesn't build or ship an ARM version of its installer. Even setting the CPU-extension issue aside, there's no official .iso file compiled for the aarch64 architecture that the Pi uses. So it's a two-layer problem: wrong architecture, and no official build for that architecture even if the hardware could somehow run it.
Why Would You Use It?
You wouldn't — not directly, anyway. But it's worth understanding why this matters before you spend money on hardware.
A lot of new homelab users assume "small computer" and "virtualization host" are basically the same shopping decision. They're not. A Raspberry Pi 5 is a genuinely capable little board for single-purpose jobs: Pi-hole, a Home Assistant instance, a print server, a retro-gaming box. What it isn't built for is running Proxmox's management stack, spinning up five VMs, and giving you snapshots, live migration, and a web GUI the way an actual x86 box would.
Knowing the hardware requirement up front means you buy the right box the first time. I've seen people buy two or three Pis before realizing none of them will ever run Proxmox, when a single $150 mini PC would have solved the actual problem.
Prerequisites
To follow the checks in this guide you'll need:
- Access to the machine you're considering (or already own) — a laptop, desktop, or dedicated server
- The ability to reboot it and enter the BIOS/UEFI setup screen if needed
- A USB flash drive of at least 8 GB if you plan to test-boot the Proxmox VE installer
- Ten minutes — checking CPU support is quick
You do not need a Raspberry Pi for this guide, though if you have one on your desk, it makes a good side-by-side example of what an unsupported chip looks like versus a supported one.
Step-by-Step Tutorial
Step 1: Check the CPU architecture of any Linux machine
On any Linux system — including a Raspberry Pi running Raspberry Pi OS — open a terminal and run:
uname -mOn a real Proxmox-capable PC or server, this returns x86_64. On a Raspberry Pi, it returns aarch64 (64-bit) or armv7l (32-bit). If you see anything other than x86_64, stop here — that board cannot run Proxmox VE, full stop, regardless of RAM or storage.
Step 2: Confirm virtualization extensions are present
Architecture alone isn't the whole story — some older or low-power x86 chips ship with virtualization extensions disabled or missing entirely. On a Linux machine that already reported x86_64, run:
egrep -c '(vmx|svm)' /proc/cpuinfovmx is the flag name for Intel VT-x, svm is AMD's equivalent for AMD-V. This command counts how many CPU cores report one of those flags. Any number greater than zero means virtualization is supported at the silicon level. A zero means either the CPU doesn't support it, or it's turned off in the BIOS.
You can also just run lscpu and look for a line reporting Virtualization: VT-x or AMD-V near the top of the output.
Step 3: Check from Windows, if that's what's currently installed
If the machine is currently running Windows and you haven't wiped it yet, open Task Manager, go to the Performance tab, click CPU, and look at the bottom right. There's a line labeled Virtualization. If it says Enabled, the CPU supports it and the BIOS isn't blocking it. If it says Disabled, the extension might just need turning on in the BIOS — see the troubleshooting section below.
Step 4: Enable virtualization in the BIOS if it's disabled
Reboot and enter the BIOS/UEFI setup (the key varies by manufacturer — commonly Del, F2, F10, or F12 right after power-on). Look for a setting named Intel VT-x, Intel Virtualization Technology, AMD-V, or SVM Mode, usually tucked under a CPU Configuration or Advanced menu. Set it to Enabled, save, and reboot. This step alone fixes a surprising number of "Proxmox installer won't detect virtualization support" complaints — the hardware was fine, the BIOS setting just wasn't flipped on.
Step 5: Try booting the Proxmox VE ISO — and understand why it fails on a Pi
If you did attempt to flash the standard Proxmox VE ISO to a USB drive or SD card and boot a Raspberry Pi from it, nothing would happen — not even a partial boot or an error screen. That's because a Pi doesn't use the same boot process as a PC. It doesn't have a traditional BIOS or UEFI firmware looking for a bootable x86 partition; it uses its own ARM-specific bootloader that expects ARM-compiled boot files. An x86-only ISO is invisible to it. There's no crash to troubleshoot because the Pi never recognizes the media as bootable in the first place.
Step 6: Choose the right path for what you actually want to build
Once you've confirmed whether your target hardware is x86-64 with virtualization enabled, you're in one of three situations:
- Your existing PC, laptop, or server passed both checks — install Proxmox VE on it directly.
- It failed the architecture check because it's a Raspberry Pi or similar ARM board — Proxmox isn't an option for that hardware; see the alternatives below.
- It's x86-64 but virtualization was disabled in the BIOS — enable it and you're good to go.
| Hardware | Architecture | Runs Proxmox VE? | What it's actually good for |
|---|---|---|---|
| Raspberry Pi 4 / 5 | ARM (aarch64) | No official build | Pi-hole, Home Assistant, single containers via Docker |
| Intel N100 mini PC | x86_64, VT-x | Yes | Full Proxmox host, several VMs and LXC containers |
| Older laptop (2012+, Core i-series) | x86_64, VT-x | Yes | A free way to test Proxmox before buying dedicated hardware |
| Budget Chromebook (some ARM models) | ARM | No | Not virtualization hardware, ARM Chromebooks are same limitation as Pi |
Commands Explained
Here's a quick reference for the commands used above, since it helps to know what each one is actually asking the system.
- uname -m — prints the machine's hardware architecture name. It's the fastest way to rule a device in or out before you even think about BIOS settings.
- egrep -c '(vmx|svm)' /proc/cpuinfo — searches the kernel's live CPU feature list for the Intel or AMD virtualization flag and counts matches. Zero means no support detected right now (which could mean the BIOS has it disabled).
- lscpu — a friendlier, human-readable summary of CPU details, including a plain "Virtualization:" line when the feature is present.
Common Errors
A few things people run into while going through this process:
"No bootable device found" on a Raspberry Pi. This isn't really an error message from Proxmox — the Pi's firmware never identified the media as something it knows how to boot. It's the architecture mismatch showing up as a blank result rather than a helpful message.
Proxmox installer says "KVM virtualization not available" mid-install on a PC. This happens on real x86_64 hardware when VT-x/AMD-V is present in the CPU but switched off in the BIOS, or when you're testing inside a nested virtual machine that doesn't pass the flag through. You can still install Proxmox VE itself in this state, but you won't be able to run KVM-based virtual machines until it's fixed — LXC containers will still work since they don't need the CPU extension.
Downloaded an ARM build of something else and assumed it would work. Some community projects (more on that below) do target ARM boards, and it's easy to mix them up with official Proxmox VE downloads. Always check the file name and source against the official proxmox.com download page.
Troubleshooting
If virtualization shows as disabled and enabling it in the BIOS doesn't stick, a few things to check:
- Some laptops hide the setting under a security or "Trusted Computing" section rather than CPU configuration — look there if the obvious menu is empty.
- A handful of business laptops lock the setting behind a BIOS password set by a previous owner or IT department; you'll need to reset the BIOS to factory defaults (usually a jumper on the motherboard or a battery pull) to clear that.
- If
egrep -c '(vmx|svm)' /proc/cpuinforeturns 0 even after enabling the BIOS setting, double-check you actually saved the change — some BIOS menus need F10 specifically rather than just backing out of the menu.
If you've confirmed the hardware is genuinely ARM (a Pi, most phones, many ARM Chromebooks), there's no setting to flip. That's a permanent no for official Proxmox VE, not a temporary limitation.
Best Practices
A few things worth doing before you commit money or time to a virtualization project:
Check the CPU architecture before you buy anything, not after. It takes thirty seconds to look up a product's spec sheet for "x86_64" or "ARM" — cheaper than returning hardware.
If budget is the actual constraint that pushed you toward a Raspberry Pi, look at used business mini PCs (Dell OptiPlex Micro, HP EliteDesk, Lenovo ThinkCentre Tiny) or newer Intel N100-based mini PCs. Both categories regularly sell for $80–200 and meet Proxmox's requirements comfortably, often with lower idle power draw than people expect from a "PC."
Don't try to route around the architecture limitation with emulation. Running an x86 emulator on ARM hardware to trick Proxmox into installing is technically something people have attempted, and it's slow enough to be pointless for anything beyond a curiosity — you'd be emulating a hypervisor to run virtual machines on top of an emulator, several layers removed from real hardware speed.
Frequently Asked Questions
Does Proxmox VE have any official ARM support at all?
No. As of the current Proxmox VE releases, the project only builds and supports x86_64 installer images. There's no official arm64 ISO.
I've seen "PXVirt" or similar community projects claiming to run a Proxmox-like environment on a Pi. Is that the same thing?
No — those are independent community efforts, not Proxmox Server Solutions GmbH releases. They aren't covered by official Proxmox support, updates, or documentation, so treat them as separate projects to research on their own merits rather than a Pi-compatible version of Proxmox VE.
Can I at least run virtual machines on a Raspberry Pi some other way?
Yes. Raspberry Pi 4 and 5 use ARM Cortex-A cores that do support ARM's own virtualization extensions, so plain KVM through QEMU and libvirt works directly on Raspberry Pi OS. You lose Proxmox's web interface, clustering, and management tooling, but the underlying virtualization capability is there if you're comfortable with the command line.
Will Proxmox ever officially support ARM?
The project has discussed it in community forums, but there's no official release or committed timeline. Don't plan a purchase around it happening.
What's the cheapest hardware that will actually run Proxmox VE well?
For a first homelab node, look at anything with an Intel Core i5 (6th generation or newer) or an Intel N100, 8 GB of RAM minimum, and a small SSD. Used mini PCs in that spec range are the closest thing to "Pi-cheap" that still meets Proxmox's real requirements.
Conclusion
The Raspberry Pi is a great board — just not for this. Proxmox VE needs a 64-bit x86 CPU with hardware virtualization support, and no Pi model provides either. That's not a limitation you can patch around with a config file or a BIOS toggle; it's baked into the chip.
The good news is that hardware meeting Proxmox's actual requirements has gotten a lot cheaper and smaller in the last few years. A secondhand mini PC or a new Intel N100 box gets you real KVM virtualization, snapshots, and the full Proxmox web interface for not much more than a Pi 5 kit costs — and it'll actually boot the installer the first time you try.