Comment 1 for bug 2025658

$ apt-cache rdepends desktop-base
desktop-base
Reverse Depends:
  arctica-greeter-theme-debian-softwaves
  xfce4
  wmaker
  ukui-desktop-environment
  task-desktop
  sddm-theme-debian-maui
  sddm-theme-debian-elarun
  sabily-grub-artwork
  phosh-full
  notcurses-bin
  neurodebian-desktop
 |mate-desktop-environment
  lxqt-theme-debian
  lxdm
  lightdm-gtk-greeter
  gnome-session-flashback
  gnome-session
  gnome
  cinnamon-core
  arctica-greeter-theme-debian-futureprototype
  grub-common
  arctica-greeter-theme-debian
  plymouth
  grub-pc-bin

So it is better if kubuntu-settings-desktop depends on desktop-base and does not provide the duplicate file.