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How can I change the theme (or at least background picture) of a lock screen in Linux Mint 15 with KDE desktop? It is not consistent with log in screen and looks out of place. Nothing found in settings or online...

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I managed to fix it by going into the folder with themes and replacing the default background image of default theme (keeping the name and dimensions). I understand there must be a better solution, but I'm not aware of any.

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