I've hit this same issue with all my libvirt-managed kvm VMs too:
$ virsh start sec-hardy-i386
error: Failed to start domain sec-hardy-i386
error: Failed to add tap interface to bridge 'br0': No such file or directory
** Also affects: libvirt (Ubuntu)
Importance: Undecided
Status: New
** Changed in: libvirt (Ubuntu)
Importance: Undecided => High
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Eucalyptus 1.6.2 fails to boot an instance: Failed to add tap interface to
bridge 'br0'
https://bugs.launchpad.net/bugs/499491
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