Just found out that Promox now supports Arm64.
Initial released focuses on supporting:
NVIDIA Grace and NVIDIA Vera platforms. Other UEFI-based ARMv9-A or newer hardware is supported on a best-effort basis.
Just wondering if the Ten64 can support or any installation instructions? The unofficial Promox, hasn’t had any application updates recently only the Debian OS updates.
I haven’t had a chance to try yet, but they say this in their forum post. I think installing it on top of a working Debian install is the best method:
Q: Can I install Proxmox VE on top of Debian 13 “Trixie” for arm64?
A: Yes, the procedure is the same as on x86-64, see Install Proxmox VE on Debian 13 Trixie - Proxmox VE
I would avoid installing their kernel as it might not have the drivers needed for Ten64.
They say only hosts that use ACPI are officially supported, but I suspect that is an enterprise support related restriction (Red Hat made the same “threat” a while ago with RHEL), I can’t see any reason why it won’t work on Device Tree hardware.
Thank you.
I just did the upgrade by just using the Proxmox web interface.
Disabled the other Promox repository.
Added the no subscription proxmox official
Confirmed no kernel upgrade or changes.
Updated and rebooted.
No issues so far 
Their kernel doesn’t have any device-trees built at all.
You can’t safely install the proxmox-ve metapackage, unless you use the equivs tool to make a fake package that replaces proxmox-default-kernel and pve-firmware.
However, a bunch of the UI assumes x86. For example, the GPU selection list for VMs has values that don’t work for arm64, and lacks values that work for arm64. There are several other such assumptions I can’t remember at the moment.
In my case, I decided it’s better to just use regular Debian or Ubuntu and run libvirtd. I usually run virt-manager over ssh -X (or rather, ssh -XY), since virt-manager’s own ssh connection doesn’t seem to reliably support 1password’s ssh-agent feature.