Proxmox VE 9.2-1 ISO not installing in nested Hyper-V

[Mario Fuchs]

Hello,

im trying to install PVE 9.2-1 in a nested Hyper-V VM. The Media is booting but the ISO Image is not recognized. (see Screenie). The same VM works with 9.1-1.
I have already recreated the vm, double checked the iso and hash.

Has anyone seen this issue? Or even better got a solution for it.

Regards
Mario Fuchs

 

[YaZoal]

Hello,
Not sure, but have you tried to re-installing the ISO?
I just tested a nested installation of PVE 9.2 on PVE host and it worked:

 

[JesperNilsson79]

I have the Same issue, 9.2 do not work in Hyper-V nested virtualization, 8.4 works fine..

 

[foxcomm]

Same exact issue here under Windows 2025 Hyper-V Server attempting to install as a version 2 Hyper-V VM with BOTH the new proxmox-ve_9.2-1.iso or proxmox-backup-server_4.2-1.iso. Something has broken.

Proxmox Development: Please fix this. Be happy to supply any debug data needed.

Install works fine using the previous PVE or PBS installer .ISO files such as: proxmox-ve_9.1-1.iso.

Thank You

 

[foxcomm]

Attempted to work around this using iVentoy (Network Boot) and run into the exact same issue there as well.

 

[krasiaa123]

Same issue here. Version 9.2-1 runs successfully as a nested VM under both ESXi and PVE, but on Hyper-V it crashes with a kernel panic showing the same behavior you are experiencing. If you install version 9.1 first, it boots correctly and the installation completes successfully. Upgrading that installation to the latest 9.2-1 release also works without any major issues. However, the 9.2-1 installation media itself fails to boot completely. After the initramfs stage, the system is unable to locate the CD/DVD device, causing the boot process to fail.

 

[bindi]

The nested VM in the title is quite misleading or not part of the problem here.

The main problem is that 9.2 PVE installer ISO does not boot on Hyper-V (at least Gen2) at all, 9.1 works fine.

Lots of hv_ modules missing?




Edit: same thing with PBS 4.2-1. Also the keyboard doesn't work in the prompt (both PBS/PVE) because hid_hyperv/hyperv_keyboard is missing.

 

[krasiaa123]

The nested VM in the title is quite misleading or not part of the problem here.

The main problem is that 9.2 PVE installer ISO does not boot on Hyper-V (at least Gen2) at all, 9.1 works fine.

Lots of hv_ modules missing?


View attachment 98790

Ah, I see, that's the issue. It makes sense if it's caused by missing Hyper-V drivers. The question is, who should we report this to or address it with? Possibly raising a BugZilla issue...

 

[bindi]

Ah, I see, that's the issue. It makes sense if it's caused by missing Hyper-V drivers. The question is, who should we report this to or address it with? Possibly raising a BugZilla issue...

Yes, I do think the Proxmox teams prefers using Bugzilla for reports like this.