Hello I had the same trouble, but I solved it.<br>Are you sure that your user (the one who try to run virt-manager) is in the group 'libvirt' ?<br>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)<br>
I founded that info on <a href="http://wiki.debian.org/KVM">http://wiki.debian.org/KVM</a>.<br>Regards,<br>Laurent<br>