Actually this is, I think, an update-manager bug. python-gconf does need to be rebuilt for python2.7, but python2.6 is the default python in Natty and so that's what update-manager should be using.
Actually this is, I think, an update-manager bug. python-gconf does need to be rebuilt for python2.7, but python2.6 is the default python in Natty and so that's what update-manager should be using.