then i've no idea any more, sorry...
Stopping my work for a while.
Hi Leiche,
I might have THE solution.

I have taken your version apt-sources-update-0.3.1-4leiche2011.i586.rpm and reinstalled it. See ?
# apt-cache show apt-sources-update
Package: apt-sources-update
Section: System/Configuration/Packaging
Installed Size: 33528
Packager: leiche
Version: 0.3.1-4leiche2011
Depends: zenity, curl, wget
Provides: apt-sources-update = 0.3.1-4leiche2011, apt-sources-update(x86-32) = 0.3.1-4leiche2011
Architecture: i586
Size: 1
MD5Sum:
Filename:
Summary: Utility for optimizing PCLinuxOS repository sources.list
Description:
apt-sources-update is a utility that will download the latest PCLinuxOS apt
sources.list from the main ibiblio server, verify that they
have been recently synced to the ibiblio server, and test
all updated repositories for download speed.
Once testing is completed the user will be given a speed
rated list of repositories from which they can select a
default repository to use for future software needs.
I have ktsuss installed in my system. What is ktsuss ?
Description :
ktsuss stands for "keep the su simple, stupid", and as the
name says, is a graphical version of su written in C and
GTK+ 2.The idea of the project is to remain simple and bug
free.
Simple and bug free...

I have modified your apt-sources-update of that one version (which was working well apart from the ldconfig message... ) and changed theses 2 lines:
line 133 :
synaptic &to
ktsuss synaptic &and line 455 :
synaptic -rto
ktsuss synaptic -rThen did a sync (is that useful ? I'm not sure... ) then started apt-sources-update from the menus, then it worked asked for the repo I wanted, I chose another one, not so fast, but to see one that is different... when it was time to overwrite the /etc/apt/sources.list file I was prompted for the root password, then Synaptic was opened, with the window for the list of repos, and then I installed
Commit Log for Sat Aug 6 12:38:20 2011
Les paquets suivants ont été installés :
emelfm2 (0.7.3-1pclos2010)
gkrellm (2.3.5-1pclos2010)
gkrellm-plugins (2.3.5-2pclos2011)
No more ldconfig message !

If other testers could confirm this find, I would suggest to make ktsuss king of the windowed su commands !!! \o/
