Comment 5 for bug 787091

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Serge Hallyn (serge-hallyn) wrote :

Thanks for taking the time to submit this bug and helping to make Ubuntu better.

dmesg has no more apparmor errors, so it is not likely the cause of the permission denial. But libvirt is supposed to change the ownership of the usb device so that libvirt can access it. So I'm not sure what is causing this.

Could you append your /etc/libvirt/qemu.conf file, and /var/log/libvirt/qemu/VM.log where VM is the name of the libvirt vm and the result of 'ls -l /dev/bus/usb/001/004'.