[Bug 1505576] [NEW] internal error: Failed to initialize a valid firewall backend

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on a current wily environment:

trying to create a virtual machine using the instructions from
https://help.ubuntu.com/lts/serverguide/libvirt.html

$ virt-install -n trusty_buildd -r 4096 --disk
path=/mnt/ssd/images/trusty_buildd.img,bus=virtio,size=80 -c Downloads
/trusty-server-cloudimg-amd64-disk1.img --network
network=default,model=virtio --graphics vnc,listen=0.0.0.0
--noautoconsole -v

Installation wird gestartet...
ERROR    Angeforderte Operation ist nicht gültig: network 'default' is not active

$ virsh net-list --all
 Name                 State      Autostart     Persistent
----------------------------------------------------------
 default              inactive   yes           yes

$ virsh net-start default
error: Failed to start network default
error: internal error: Failed to initialize a valid firewall backend

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: Confirmed

-- 
internal error: Failed to initialize a valid firewall backend
https://bugs.launchpad.net/bugs/1505576
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