sudo apt install --reinstall 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: kdepasswd but it is not going to be installed
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.