When you are going to update your Kubuntu, you can try to "hold" a package before really doing it... and see the difference between the good behavior of "sudo apt-get update && sudo apt-get dist-upgrade" and the bad one of the graphical update program.
STEPS TO REPRODUCE
When you are going to update your Kubuntu, you can try to "hold" a package before really doing it... and see the difference between the good behavior of "sudo apt-get update && sudo apt-get dist-upgrade" and the bad one of the graphical update program.