The best I can say is to try installing these as dependencies, because I’m starting to get lost in the ubuntu based distros different package sources

sudo apt install kf6-kcoreaddons-dev kf6-kcolorscheme-dev kf6-kguiaddons-dev kf6-kiconthemes-dev kf6-kconfig-dev kf6-ki18n-dev kf6-kwindowsystem-dev kf6-kirigami-dev kf6-kcmutils-dev