installing updates on i386 maverick wants to remove plasma-desktop

Adding ppa:kubuntu-ppa/ppa on a clean i386 installation leads to:

# apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be REMOVED:
  kdebase-workspace-bin kubuntu-desktop plasma-dataengines-workspace plasma-desktop plasma-netbook plasma-widgets-workspace
The following packages will be upgraded:
  ark dolphin kde-window-manager kde-zeroconf kdebase-data kdebase-runtime kdebase-runtime-data kdebase-workspace-data kdebase-workspace-kgreet-plugins kdelibs-bin kdelibs5-data kdelibs5-plugins
  kdemultimedia-kio-plugins kdepasswd kdepim-runtime kdepimlibs-kio-plugins kdm kdoctools khelpcenter4 klipper kmix konsole ksnapshot ksysguard ksysguardd libakonadi-kabc4 libakonadi-kcal4
  libakonadi-kde4 libakonadi-kmime4 libkabc4 libkatepartinterfaces4 libkcal4 libkcddb4 libkde3support4 libkdecorations4 libkdecore5 libkdesu5 libkdeui5 libkdewebkit5 libkdnssd4 libkephal4 libkfile4
  libkholidays4 libkhtml5 libkimap4 libkio5 libkjsapi4 libkjsembed4 libkldap4 libkmediaplayer4 libkmime4 libknewstuff2-4 libknewstuff3-4 libknotifyconfig4 libkntlm4 libkonq5 libkonq5-templates
  libkparts4 libkpimutils4 libkpty4 libkresources4 libkrosscore4 libkrossui4 libkscreensaver5 libksgrd4 libksignalplotter4 libktexteditor4 libkunitconversion4 libkutils4 libkwineffects1a
  libkworkspace4 libmailtransport4 libmicroblog4 libnepomuk4 libnepomukquery4a libokularcore1 libplasma-geolocation-interface4 libplasma3 libplasmaclock4b libplasmagenericshell4 libprocesscore4a
  libprocessui4a libsolid4 libsolidcontrol4a libsolidcontrolifaces4 libssl0.9.8 libsyndication4 libtaskmanager4a libthreadweaver4 libweather-ion4a okular oxygen-icon-theme
  plasma-scriptengine-javascript python-kde4 systemsettings
95 upgraded, 0 newly installed, 6 to remove and 0 not upgraded.

This doesn't happen on amd64 for some reason, aptitude also behaves properly.