Bug#580439: [bug 580439] Verification...

[Laurent GEHLEN]

Hello I had the same trouble, but I solved it.
Are you sure that your user (the one who try to run virt-manager) is in the
group 'libvirt' ?
if not a simple 'adduser <youruser> libvirt' will solve it. (don't forget to
restart the X-session of the user after added in the right group)
I founded that info on http://wiki.debian.org/KVM.
Regards,
Laurent