Did you install a third party package which may prevent kubuntu-kde4-desktop from installing ? If so can you please remove those packages and replay the upgrade.
Can you try the following command and see what is the proposed solution:
$ sudo apt-get install kubuntu-kde4-desktop
Did you install a third party package which may prevent kubuntu- kde4-desktop from installing ? If so can you please remove those packages and replay the upgrade.
Can you try the following command and see what is the proposed solution: kde4-desktop
$ sudo apt-get install kubuntu-
Thanks in advance.