Install sddm-theme-elarun by entering the following commands in the terminal:
sudo apt update sudo apt install sddm-theme-elarun
Description:
'Elarun' Theme for SDDM X11 display manager
Elarun theme for SDDM
Homepage: https://github.com/sddm/sddm
Version: 0.17.0-1ubuntu7
Section: universe/kde