Comment 5 for bug 1024204

I have the same problem with upgrading ubuntu server from 14.04 to 14.10.

Unpacking ubuntu-minimal (1.327) ...
Setting up python3 (3.4.2-1) ...
running python rtupdate hooks for python3.4...
dpkg-query: package 'rhythmbox-plugin-magnatune' is not installed
Use dpkg --info (= dpkg-deb --info) to examine archive files,
and dpkg --contents (= dpkg-deb --contents) to list their contents.
Traceback (most recent call last):
  File "/usr/bin/py3clean", line 200, in <module>
    main()
  File "/usr/bin/py3clean", line 186, in main
    pfiles = set(dpf.from_package(options.package))
  File "/usr/share/python3/debpython/files.py", line 53, in from_package
    raise Exception("cannot get content of %s" % package_name)
Exception: cannot get content of rhythmbox-plugin-magnatune
error running python rtupdate hook rhythmbox-plugin-magnatune
dpkg-query: package 'rhythmbox-plugin-zeitgeist' is not installed
Use dpkg --info (= dpkg-deb --info) to examine archive files,
and dpkg --contents (= dpkg-deb --contents) to list their contents.
Traceback (most recent call last):
  File "/usr/bin/py3clean", line 200, in <module>
    main()
  File "/usr/bin/py3clean", line 186, in main
    pfiles = set(dpf.from_package(options.package))
  File "/usr/share/python3/debpython/files.py", line 53, in from_package
    raise Exception("cannot get content of %s" % package_name)