Comment 1 for bug 818982

I can confirm this. Simulating installation of python-pyside on an Oneiric i386 system indicates that python2.6 and libpython2.6 would be installed, and running "apt-get -s remove python-pyside.qtcore+ python2.6 libpython2.6" shows that pyside's current dependencies cannot be fulfilled even minimally without libpython2.6 (which itself has python2.6 as a required dependency). Alternatively, see python-pyside's depedencies' dependencies as listed at http://packages.ubuntu.com/oneiric/python-pyside, for example, python-pyside.qtcore's dependencies at http://packages.ubuntu.com/oneiric/python-pyside.qtcore.

As indicated at http://developer.qt.nokia.com/wiki/PySide_FAQ, upstream PySide has stable support for python 2.7, and rebuilding the software is all that is necessary.

Or perhaps Ubuntu's pyside is already built to work with either python2.6 or python2.7, and all that's necessary is to make its libpython2.6/libpython2.7 dependencies disjunctive, like its direct python2.6/python2.7 dependencies already are.