As of now we use a custom python2.7 package [1], the applied patch works around python-greenlet issue
(see bug #1342068 for more details). However most packages depend on the python meta-package
(source package python-defaults) which automatically picks a correct version of python2.7|python3.x.
The upstream python meta-package pulls the upstream python2.7 package. On the other hand some packages
(which link with libpython2.7, for instance, python-apt) depend on the customized version of the python2.7
package. As a result the provisioning of Ubuntu nodes fails since the package manager tries to install both
the upstream and the customized python2.7 packages (which is deemed to fail). See bug #1390416 for more
details.
In order to resolve the problem python-defaults package should be rebuilt (so it depends on the customized
python-2.7 package), a new repository packages/precise/python-defaults is necessary for that.
[1] https://review.fuel-infra.org/gitweb?p=packages/precise/python.git;a=summary,
Project was created.