Try to install sddm-theme-maldives and change to that theme via Systemsettings-GUI (if picture doesnt suit ur needs u can change it).
SDDM themes other than breeze are not installed by default in Kubuntu & the breeze-theme seems to fail on lack of beeing rebuild against the changes that SDDM 0.13 brought. Certainly the SDDM-devs checked against their themes but not the distro-specific ones. Somestimes it helps to read changelogs (brief)...
This issue gets covered in archlinux-forum, see comment #7 there
https:/ /bbs.archlinux. org/viewtopic. php?id= 207780
Try to install sddm-theme-maldives and change to that theme via Systemsettings-GUI (if picture doesnt suit ur needs u can change it).
SDDM themes other than breeze are not installed by default in Kubuntu & the breeze-theme seems to fail on lack of beeing rebuild against the changes that SDDM 0.13 brought. Certainly the SDDM-devs checked against their themes but not the distro-specific ones. Somestimes it helps to read changelogs (brief)...