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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'. ** Changed in: qemu-kvm (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/787091 Title: Unable to use USB device in KVM quest -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs