Missing apps on KDE main menu (Gutsy Gibbon)

[Nigel Henry]

Konquerorsu (superuser filemanager) is missing (along with a load of other KDE 
apps) from KDE's main menu on Gutsy Gibbon (Kubuntu).

If I go to /usr/share/applications/kde, I can drag konquerorsu to the desktop, 
but it won't copy to the actual desktop. It does show up though in 
the /home/user/desktop directory, and clicking on it, it brings up the box 
asking for password, and upon entering the password opens up the superuser 
version of konquerors filemanager.

I've tried various incantations of creating a link to application for it, but 
with no success.

Questions:

1: Is there a way to update KDE's main menu, so as to include all KDE apps 
that are installed?

2: Specifically. How do I get konquerorsu onto the actual desktop, so that I 
can launch it from there?

3: This is my fault for not writing down the command, but the command that 
ends up with sycoca IIRC fixed this problem in the past, but I can't remember 
the complete command. 

KDE version is: 4:3.5.8-0ubuntu2.2

Thanks for any help.

Nigel.
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