Comment 12 for bug 1386465

Same problem here: I have upgraded vom 14.04 to 14.10.

Putting apparmor in audit mode

 aa-audit /usr/sbin/libvirtd

enables me to start libvirt. I use Upstart:

$ ps -eaf|grep [u]pstart
root 541 1 0 18:57 ? 00:00:00 upstart-udev-bridge --daemon
root 1155 1 0 18:57 ? 00:00:00 upstart-socket-bridge --daemon
root 1171 1 0 18:57 ? 00:00:00 upstart-file-bridge --daemon
christi+ 2219 2209 0 18:57 ? 00:00:00 upstart --user
christi+ 2435 2219 0 18:57 ? 00:00:00 upstart-event-bridge
christi+ 2469 2219 0 18:57 ? 00:00:00 upstart-file-bridge --daemon --user
christi+ 2513 2219 0 18:57 ? 00:00:00 upstart-dbus-bridge --daemon --session --user --bus-name session
christi+ 2514 2219 0 18:57 ? 00:00:00 upstart-dbus-bridge --daemon --system --user --bus-name system

$ ps -eaf|grep [s]ystemd
root 426 1 0 18:57 ? 00:00:00 /sbin/cgmanager --sigstop -m name=systemd
root 549 1 0 18:57 ? 00:00:00 /lib/systemd/systemd-udevd --daemon
root 1214 1 0 18:57 ? 00:00:00 /lib/systemd/systemd-logind

$ sudo /sbin/init --version
init (upstart 1.13.2)

$ type init
init ist /sbin/init