I had the same problem. The crux was that there was obviously and old version of virtinst still half-installed after the upgrade from hardy. The file /usr/lib/python2.6/dist-packages/virtinst-0.300.2.egg-info for example was present on my system. I solved the problem as follows:
# Will remove ubuntu-virt-mgmt and virt-manager as well
sudo aptitude purge virtinst
sudo rm /usr/lib/python2.6/dist-packages/virtinst-0.300.2.egg-info
sudo rm -Rf /usr/lib/python2.4/dist-packages/virtinst*
sudo rm -Rf /usr/lib/python2.5/dist-packages/virtinst*
sudo rm -Rf /usr/lib/python2.6/dist-packages/virtinst*
# Will re-install virt-manager as well
sudo aptitude install ubuntu-virt-mgmt
I had the same problem. The crux was that there was obviously and old version of virtinst still half-installed after the upgrade from hardy. The file /usr/lib/ python2. 6/dist- packages/ virtinst- 0.300.2. egg-info for example was present on my system. I solved the problem as follows:
# Will remove ubuntu-virt-mgmt and virt-manager as well python2. 6/dist- packages/ virtinst- 0.300.2. egg-info python2. 4/dist- packages/ virtinst* python2. 5/dist- packages/ virtinst* python2. 6/dist- packages/ virtinst*
sudo aptitude purge virtinst
sudo rm /usr/lib/
sudo rm -Rf /usr/lib/
sudo rm -Rf /usr/lib/
sudo rm -Rf /usr/lib/
# Will re-install virt-manager as well
sudo aptitude install ubuntu-virt-mgmt
Seems to be a bug in python-support.