Thanks:

What did was use different user as root which was not present. but the commandline was

gksu root /usr/sbin/synaptic

Earlier it would ask for Root passwd from a GNOME form, now it is the KDE form, I guess GNOME form got corrupted. Say I remove Synaptic using KPackage, Do i have to download all over again for it be installed or will it be cached? What do I do if Windows Freezes, Ctrl-Alt-Delete will exit the X-Server right? is there a way of killing the app, I guess kill -pid app.?

Thanks,
AJ