Due to bug https://bugs.kde.org/show_bug.cgi?id=305988 or any other situation, if loading the user's requested background image fails it should load the plasma wallpaper instead. use image status property for this. Image { onStatusChanged: { if image.status == Image.Error { .....} } }
We no longer use lightDM, having moved to SDDM several years ago. As such, this bug report is no longer applicable. Bugs reports for the new SDDM-based login screen should be filed to one of two places: 1. Visual/UI bugs with the login screen UI itself, or feature requests: plasmashell | Theme - Breeze 2. Bugs with the login/user switching process: https://github.com/sddm/sddm/issues