SDDM

Where SDDM keeps its logs

SDDM logs to journalctl -u sddm on Linux.

Paths are printed exactly as SDDM writes them. Environment variables like %LOCALAPPDATA% and $XDG_STATE_HOME are never expanded, so a path can be pasted straight into a shell. Where a path differs between installer types or shipping flavours, each one is racked as its own card below - why that happens.

Finding your way around Linux.