I had to add the following lines to /etc/apparmor.d/abstractions/libvirt-qemu on Ubuntu 16.10.
/run/udev/data/** r, /dev/bus/usb/*/[0-9]* rw,
I had to add the following lines to /etc/apparmor. d/abstractions/ libvirt- qemu on Ubuntu 16.10.
/run/udev/data/** r, bus/usb/ */[0-9] * rw,
/dev/