latest libvirt0 upgrade breaks python-libvirt.
root@density:~# aptitude versions libvirt0
Package libvirt0:
p A 0.9.12-11+deb7u4 stable 500
p A 0.9.12.3-1 stable 500
i A 1.2.1-1~bpo70+1 wheezy-backports 100
root@density:~# aptitude versions python-libvirt
Package python-libvirt:
p 0.9.12-11+deb7u4 stable 500
p 0.9.12.3-1 stable 500
p 1.1.4-2~bpo70+1 wheezy-backports 100
root@density:~# sudo eatmydata apt-get install -t wheezy-backports python-libvirt
Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
python-libvirt : Depends: libvirt0 (= 1.1.4-2~bpo70+1) but 1.2.1-1~bpo70+1 is to be installed
E: Unable to correct problems, you have held broken packages.
The update to libvirt0 is much appreciated, but the problem with python-libvirt blocks virt-manager and virt-viewer and causes some breakage.