Install kde-config-sddm by entering the following commands in the terminal:
sudo apt update sudo apt install kde-config-sddm
Description:
KCM module for SDDM
KDE systemsettings module to configure SDDM login manager.
Homepage: https://projects.kde.org/projects/kde/workspace/sddm-kcm
Version: 4:5.12.4-0ubuntu1
Section: universe/kde