OK, I have found the solution: kubuntu-desktop has not been installed by the upgrade procedure (apparently I had removed it earlier). So, the upgrade procedure should make sure that kubuntu-desktop is installed. I think this was actually the case for Karmic, I think I recall it installing kubuntu-desktop for me.
...to.
OK, I have found the solution: kubuntu-desktop has not been installed by the upgrade procedure (apparently I had removed it earlier). So, the upgrade procedure should make sure that kubuntu-desktop is installed. I think this was actually the case for Karmic, I think I recall it installing kubuntu-desktop for me.