>
> if you are using kvm/qemu with libvirt you can try to delete the
> snapshot with the qemu monitor commands.
> The general syntax is
> virsh qemu-monitor-command --hmp <domain> '<command> [...]'
>
> So you can try
> virsh qemu-monitor-command --hmp DOMINO1-prealloc 'info snapshots'
>
> and thne delete it with the provided snapshot ID
> virsh qemu-monitor-command --hmp DOMINO1-prealloc 'delvm <ID>'
>
> This will delete the snapshot from your diskimage.

Thanks Christian; this works too on a system with newer libvirt, but on my old ubuntu 10.10 this command is unknown, so I had to resort to Python to solve my problem.  But it is solved :-).

Grts, J