Comment 17 for bug 1817943

@Brian - I'll provide a new libvirt upload in Disco once I have these things upstream.

Until then you can just go on with the apparmor rules you added manually.
For the crash, could you try it with [1] enabled?
It has an important fix in mesa ro work with qemu gl graphics - not the same you have but still a hard requirement. Since the new mesa stack might change other things it might be worth a try.
If you still crash open a new bug about it stating the libvirt/qemu/mesa/nidia-driver levels you are on - no promise on the speed on that as I lack the HW right now.

[1]: https://launchpad.net/~canonical-x/+archive/ubuntu/x-staging