This bug was fixed in the package libvirt - 0.7.5-5ubuntu17
--------------- libvirt (0.7.5-5ubuntu17) lucid; urgency=low
* debian/libvirt-bin.upstart: bring virbr0 up/down on upstart start/stop of libvirt, LP: #345485 -- Dustin Kirkland <email address hidden> Thu, 01 Apr 2010 23:08:33 -0500
This bug was fixed in the package libvirt - 0.7.5-5ubuntu17
---------------
libvirt (0.7.5-5ubuntu17) lucid; urgency=low
* debian/ libvirt- bin.upstart: bring virbr0 up/down on upstart start/stop
of libvirt, LP: #345485
-- Dustin Kirkland <email address hidden> Thu, 01 Apr 2010 23:08:33 -0500