Error after 4.5.3 upgrade

[Georgi Kourtev]

Dear all,

I received the update notification for KDE 4.5.3 and ran it. I noticed that 
some 50+ packages were updated, but some 10-15 others were removed, among 
which kubutu-desktop.  Thus I decided to run trough Konsole apt-get upgrade 
and saw 13 packages to be held back.

When trying to install kubuntu-desktop, I have the following output -- see 
below.  Does someone knows what to do?  Thanks.
gk

gk at xxx-laptop:~$ sudo apt-get install kubuntu-desktop 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 kubuntu-desktop : Depends: kde-window-manager but it is not going to be 
installed
                   Depends: kdebase-workspace-bin but it is not going to be 
installed
                   Depends: kdepasswd but it is not going to be installed
                   Depends: kdm but it is not going to be installed
                   Depends: ksysguard but it is not going to be installed
                   Depends: plasma-desktop but it is not going to be installed
                   Depends: plasma-netbook but it is not going to be installed
                   Recommends: kubuntu-konqueror-shortcuts but it is not going 
to be installed
                   Recommends: plasma-widgets-addons but it is not going to be 
installed
                   Recommends: rekonq but it is not going to be installed
E: Broken packages