https://bugs.kde.org/show_bug.cgi?id=475411
--- Comment #1 from Linglong ---
this page describes the bug, and give a manual solution.
https://forum.manjaro.org/t/cant-set-boot-splash-screen-setting-boot-splash-in-appearance-fails/149308/7
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https://bugs.kde.org/show_bug.cgi?id=475411
Bug ID: 475411
Summary: Plymouth boot splash screen can't see preview and
fails to power on but works when powering off
Classification: Applications
Product: systemsettings
Version: