In home:pgajdos:python, there are all packages which depends on unittest2 in Factory, as Dominique suggested. There are currently only two failures and they seem to be unrelated, present in devel projects. Packages that have to be changed: python-yaql (patch), python-oslo.privsep (patch), python-osc-lib (patch), python-openstackclient (patch), python-barbicanclient (patch), breezy (version update), cloud-init (version update). Should I check more?