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nuno-linux ~ # sudo add-apt-repository ppa:ubuntu-mozilla-daily/ppa

Traceback (most recent call last):

  File "/usr/bin/add-apt-repository", line 65, in <module>

    if not sp.add_source_from_line(line):

  File "/usr/lib/python2.6/dist-packages/softwareproperties/SoftwareProperties.py", line 630, in add_source_from_line

    (deb_line, file) = expand_ppa_line(line.strip(), self.distro.codename)

  File "/usr/lib/python2.6/dist-packages/softwareproperties/ppa.py", line 47, in expand_ppa_line

    sourceslistd = apt_pkg.Config.find_dir("Dir::Etc::sourceparts")

AttributeError: 'module' object has no attribute 'Config'