The GUI tool appears to be internally calling the legacy command: sddm-greeter --test-mode --theme /path/
However on Lubuntu 26.04 (which is fully migrated to Qt6), that binary no longer works or is missing. The test mode now requires the updated Qt6 executable: sddm-greeter-qt6 --test-mode --theme /path/ Running 'sddm-greeter-qt6' manually via terminal works perfectly, proving that the theme preview engine is intact, but the graphical configuration application has an outdated hardcoded command path. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2107720 Title: when using sddm configuration, under the theme tab, I click the preview button. but all that shows up is the button in the corner, no preview To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sddm-conf/+bug/2107720/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
