[Bug 1096125] [NEW] virsh create-snapshot fails

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Hello,

i have a plain installation of Ubuntu 12.10 server,
i installed package ubuntu-virt-server and added the user to the kvm and libvirtd group. (qemu-kvm 1.2 libvirt 0.9.13)
After that i can run kvm virtual machines.

Now i am trying to get a snapshot of the disk (first step to achieve live backup of virtual machines)
virsh snapshot-create-as [vmname] snapshot1 "snapshot" --disk-only --atomic

but i am getting the following error:
error: internal error unable to execute QEMU command 'transaction': Could not open '/var/lib/libvirt/images/ubu1204.snapshot1'

(i even tryed with permission 777 )

** Affects: libvirt (Ubuntu)
     Importance: High
         Status: In Progress

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virsh create-snapshot fails
https://bugs.launchpad.net/bugs/1096125
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