[Bug 1153267] [NEW] Cannot edit sources using synaptic

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I cannot edit the /etc/apt/sources.list using synaptic packet manager.

When I select "" I get a dialog saying that the packet sources have been
changes and I should click on "reload".

Original German text:
"Paketquellen wurden geändert

Die Informationen der Software-Paketquellen haben sich geändert. Um die
Änderungen zu übernehmen, klicken Sie bitte auf "Neu laden". "

This happens every time. The terminal says:

Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 104, in <module>
    app = SoftwarePropertiesGtk(datadir=options.data_dir, options=options, file=file)
  File "/usr/lib/python2.7/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 134, in __init__
    proxy = bus.get_object("com.ubuntu.SoftwareProperties", "/")
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1

The machine is a Strato virtual server running Ubuntu 12.04.2 LTS
(GNU/Linux 2.6.32-042stab055.12 i686).

# uname -s -r -v -o -i -m -p
Linux 2.6.32-042stab055.12 #1 SMP Wed May 23 16:07:36 MSD 2012 i686 athlon i386 GNU/Linux


My sources.list:

# See sources.list(5) for more information, especialy
# Remember that you can only use http, ftp or file URIs
# CDROMs are managed through the apt-cdrom tool.

deb ftp://ftp.stratoserver.net/pub/linux/ubuntu precise main restricted universe
deb-src ftp://ftp.stratoserver.net/pub/linux/ubuntu precise main restricted universe

deb ftp://ftp.stratoserver.net/pub/linux/ubuntu precise-updates main restricted universe
deb-src ftp://ftp.stratoserver.net/pub/linux/ubuntu precise-updates main restricted universe

deb ftp://ftp.stratoserver.net/pub/linux/ubuntu precise-security main restricted universe
deb-src ftp://ftp.stratoserver.net/pub/linux/ubuntu precise-security main restricted universe

#deb http://mirror.kolabsys.com/pub/ubuntu/incoming/kolab-2.4 precise release updates
#deb-src http://mirror.kolabsys.com/pub/ubuntu/incoming/kolab-2.4 precise release updates

deb http://mirror.kolabsys.com/pub/ubuntu/kolab-3.0/ precise release
updates


# apt-cache policy synaptic
synaptic:
  Installiert: 0.75.9ubuntu1
  Kandidat:    0.75.9ubuntu1
  Versionstabelle:
 *** 0.75.9ubuntu1 0
        500 ftp://ftp.stratoserver.net/pub/linux/ubuntu/ precise/universe i386 Packages
        100 /var/lib/dpkg/status

** Affects: software-properties (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: bot-comment sources.list synaptic
-- 
Cannot edit sources using synaptic
https://bugs.launchpad.net/bugs/1153267
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