Precise to Quantal desktop upgrade failed: dpkg - error processing python3

[Victor Zhou]

Setting up python-crypto (2.6-2) ...
Setting up python3 (3.2.3-3) ...
Traceback (most recent call last):
  File "/usr/bin/py3clean", line 182, in <module>
    main()
  File "/usr/bin/py3clean", line 174, in main
    files = files & pfiles
TypeError: unsupported operand type(s) for &: 'generator' and 'generator'
error running python rtupdate hook ubuntu-drivers-common
dpkg: error processing python3 (--configure):
 subprocess installed post-installation script returned error exit status 4

Link to the test: https://jenkins.qa.ubuntu.com/view/Quantal/view/Upgrade%20Testing%20Dashboard/job/quantal-upgrade-precise-desktop/59/ARCH=i386,LTS=non-lts,PROFILE=desktop,label=upgrade-test/

[Raphaël Hertzog (hertzog)]

This is obviously not a dpkg bug... given the error message I believe it's ubuntu-drivers-common that registers an rtupdate script which is failing for some reason (not compatible with python3 maybe?).

[Martin Pitt (pitti)]

This was fallout from a recent bug in python3-defaults/python3.