Needs to add some logs: /var/log/sddm.log, /var/log/xsessionerrors.log (may be older ones too)
Please check also if there is a /ect/sddm.conf, it may also exist in /home/~/.config (which is a complete fail and was corrected in SDDM 0.13, but not backported)
Hence it may help to install sddm-theme-maldives and to change then to that theme via system-seetings.
Setting bug-status to incomplete, as it's hard to make guesses w/o knowing more about the affected system (like having an encryted home-partition or beeing multi Desktop-environment)
Needs to add some logs: /var/log/sddm.log, /var/log/ xsessionerrors. log (may be older ones too)
Please check also if there is a /ect/sddm.conf, it may also exist in /home/~/.config (which is a complete fail and was corrected in SDDM 0.13, but not backported)
Hence it may help to install sddm-theme-maldives and to change then to that theme via system-seetings.
Setting bug-status to incomplete, as it's hard to make guesses w/o knowing more about the affected system (like having an encryted home-partition or beeing multi Desktop- environment)