Will that also cure the problem of the error report that there is no such file as I stated?
I am no sure if it'll do.
Some time ago this executable file was named as *.sh file but it seems now it is renamed (by updates I suppose).
You should be able to edit the line in Administration -->Repo Speed Test item. As far as I don't use Gnome I don't know how exactly it can be done; you may be ask in the Gnome section of forum about this.
So if your actual file name is apt-sources-update and the line in the menu item says apt-sources-update.sh just remove the ".sh" part in the menu item.
Or he could do it the universal way, by going into /usr/share/applications and change apt-sources-update.desktop from
[Desktop Entry]
Name=Update Package Sources List
Type=Application
Exec=/usr/bin/
apt-sources-update.sh -w
Icon=synaptic
Comment=Utility for optimizing PCLinuxOS repository sources.list
Categories=X-MandrivaLinux-System-Configuration-Packaging;Settings;PackageManager;System
to
[Desktop Entry]
Name=Update Package Sources List
Type=Application
Exec=/usr/bin/
apt-sources-update -w
Icon=synaptic
Comment=Utility for optimizing PCLinuxOS repository sources.list
Categories=X-MandrivaLinux-System-Configuration-Packaging;Settings;PackageManager;System