[Jaunty] "software-properties-gtk -e" brings duplicated components in /etc/apt/sources.list

[STGSAGWAN]

"software-properties-gtk -e" brings duplicated components in /etc/apt/sources.list .

$ lsb_release -rd
Description: Ubuntu 9.04
Release: 9.04

$ dpkg -l | grep software-proper
ii python-software-properties 0.71.5 manage the repositories that you install sof
ii software-properties-gtk 0.71.5 manage the repositories that you install sof

-----
Here is an example that shows what happens after the software-properties-gtk -e command is executed:

[BEFORE]
$ cat /etc/apt/sources.list
deb http://ja.archive.ubuntu.com/ubuntu/ jaunty main restricted
deb http://ja.archive.ubuntu.com/ubuntu/ jaunty universe

$ sudo software-properties-gtk -e universe

[AFTER]
$ cat /etc/apt/sources.list
deb http://ja.archive.ubuntu.com/ubuntu/ jaunty main restricted universe
deb http://ja.archive.ubuntu.com/ubuntu/ jaunty universe

$ sudo apt-get update
Get:1 http://archive.ubuntulinux.jp jaunty Release.gpg [307B]
Get:2 http://archive.ubuntulinux.jp jaunty-non-free/ Release.gpg [189B]
Get:3 http://archive.ubuntulinux.jp jaunty Release [52.9kB]
Get:4 http://archive.ubuntulinux.jp jaunty-non-free/ Release [742B]
Ign http://archive.ubuntulinux.jp jaunty/main Packages
Hit http://ja.archive.ubuntu.com jaunty Release.gpg
Ign http://archive.ubuntulinux.jp jaunty-non-free/ Packages
Get:5 http://archive.ubuntulinux.jp jaunty/main Packages [6711B]
Get:6 http://archive.ubuntulinux.jp jaunty-non-free/ Packages [2524B]
Hit http://ja.archive.ubuntu.com jaunty Release
Hit http://ja.archive.ubuntu.com jaunty/main Packages
Hit http://ja.archive.ubuntu.com jaunty/restricted Packages
Hit http://ja.archive.ubuntu.com jaunty/universe Packages
Fetched 63.4kB in 1s (50.7kB/s)
Reading package lists...
W: Duplicate sources.list entry http://ja.archive.ubuntu.com jaunty/universe Packages (/var/lib/apt/lists/ja.archive.ubuntu.com_ubuntu_dists_jaunty_universe_binary-i386_Packages)
W: You may want to run apt-get update to correct these problems

-----
Here is an expected result:

[AFTER]
$ cat /etc/apt/sources.list
deb http://ja.archive.ubuntu.com/ubuntu/ jaunty main restricted
deb http://ja.archive.ubuntu.com/ubuntu/ jaunty universe

[STGSAGWAN (sakura-launchpad-bugreport)]

This does not happen with Hardy nor with Intrepid.

[STGSAGWAN (sakura-launchpad-bugreport)]

I mistakenly did the above experiment with the server "ja.archive.ubuntu.com" instead of "jp.archive.ubuntu.com", although offtopic.
I don't think this mistake affects the results.

[Launchpad Janitor (janitor)]

This bug was fixed in the package python-apt - 0.7.12.1ubuntu1

---------------
python-apt (0.7.12.1ubuntu1) karmic; urgency=low

  [ Michael Vogt ]
  * apt/package.py:
    - add "recommends" property
  * debian/control:
    - change build-dep for libapt-pkg-dev to >= 0.7.21
  * merged with debian/unstable

  [ Loïc Minier ]
  * Revert addition of gcc and gcc_s to python-apt libs as the toolchain has
    been fixed; LP: #375334.

  [ Julian Andres Klode ]
  * apt/package.py:
   - Introduce Version.get_dependencies() which takes one or more types
     of dependencies and returns a list of Dependency objects.

python-apt (0.7.12.1) unstable; urgency=low

  * apt/debfile.py:
    - Fix missing space in message (Closes: #539704)
  * apt/package.py:
    - Add missing argument to Version.__le__() and Version.__ge__()
  * debian/control:
    - Do not build-depend on python-gtk2 and python-vte on kfreebsd-*.
  * setup.py:
    - Always build documentation, even if python-gtk2 is not installed.

python-apt (0.7.12.0) unstable; urgency=low

  [ Julian Andres Klode ]
  * python/cache.cc:
    - Support Breaks, Enhances dependency types (Closes: #416247)
  * debian/control:
    - Only recommend libjs-jquery (Closes: #527543)
    - Build-depend on libapt-pkg-dev (>= 0.7.22~)
    - Update Standards-Version to 3.8.2
  * apt/cache.py:
    - Correctly handle rootdir on second and later invocations of
      open(), by calling InitSystem again. (LP: #320665).
    - Provide broken_count, delete_count, install_count, keep_count
      properties (Closes: #532338)
    - Only create Package objects when they are requested, do not keep them in
      a dict. Saves 10MB for 25,000 packages on my machine.
  * apt/package.py:
    - Allow to set the candidate of a package (Closes: #523997)
      + Support assignments to the 'candidate' property of Package objects.
      + Initial patch by Sebastian Heinlein
    - Make comparisons of Version object more robust.
    - Return VersionList objects in Package.versions, which are sequences
      and also provide features of mappings. (partial API BREAK)
      + Allows to get a specific version (Closes: #523998)
  * apt/progress/__init__.py:
    - Do not break out of InstallProgress.waitChild()'s loop just because it
      is hitting EINTR, but only on child exit or on ECHILD.
  * Use debhelper 7 instead of CDBS

  [ Stefano Zacchiroli ]
  * debian/python-apt.doc-base: register the documentation with the
    doc-base system (Closes: #525134)

  [ Sebastian Heinlein ]
  * apt/progress.py: Extract the package name from the status message
    (Closes: #532660)

python-apt (0.7.11.1) unstable; urgency=low

  [ Stephan Peijnik ]
  * apt/progress/__init__.py:
    - Exception handling fixes in InstallProgress class.

  [ Michael Vogt ]
  * python/tag.cc:
    - merge patch from John Wright that adds FindRaw method
      (closes: #538723)

python-apt (0.7.11.0) unstable; urgency=low

  [ Julian Andres Klode ]
  * data/templates/Debian.info.in: Squeeze will be 6.0, not 5.1

  [ Stephan Peijnik ]
  * apt/progress/__init__.py:
    - add update_status_full() that takes file_size/partial_size as
      additional callback arguments
    - add pulse...