@pavkamlc Hi !
Usually I convert my qcow2 file to VHD directly on Proxmox.
As far as I remember, when I crashed my Proxmox in the school lab, I didn't succeed to convert the image directly on a Linux box.
I found a workaround, but it's pretty messy:
Install a Debian VM Install the proxmox-ve package (you'll need the Proxmox repository) Mount your shared storage directly on your new VM (with NFS for example). Then, you can convertLet me know if it's working !