If you remove the init script for plasma this goes away
rm /usr/share/kubuntu-default-settings/kde4-profile/default/share/apps/plasma-desktop/init/01-kubuntu-default-setup.js
If you remove the init script for plasma this goes away
rm /usr/share/ kubuntu- default- settings/ kde4-profile/ default/ share/apps/ plasma- desktop/ init/01- kubuntu- default- setup.js