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Reading package lists...
Building dependency tree...
Reading state information...
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: software-properties-kde but it is not going to be installed
                   Recommends: akregator but it is not going to be installed
                   Recommends: apport-kde but it is not going to be installed
                   Recommends: apturl-kde but it is not going to be installed
                   Recommends: kaddressbook but it is not going to be installed
                   Recommends: kdepim-kresources but it is not going to be installed
                   Recommends: kmail but it is not going to be installed
                   Recommends: knotes but it is not going to be installed
                   Recommends: kontact but it is not going to be installed
                   Recommends: korganizer but it is not going to be installed
                   Recommends: muon-discover but it is not going to be installed
                   Recommends: muon-notifier but it is not going to be installed
                   Recommends: plasma-widgets-addons but it is not going to be installed
                   Recommends: usb-creator-kde but it is not going to be installed
E: Unable to correct problems, you have held broken packages.