>What i suggest is have Ubuntu automaticly copy your desktop background to a common folder, so unity-greeter can use that folder.
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I think you are confusing two different issues. Currently you cannot change the Unity Greeter background without editing a config file, or using a third party tweaking tool so you cannot blame ubuntu for not copying images it doesnt know about.
The Desktop background image is not the same as the Unity greeter (lightdm) background.
>What i suggest is have Ubuntu automaticly copy your desktop background to a common folder, so unity-greeter can use that folder.
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I think you are confusing two different issues. Currently you cannot change the Unity Greeter background without editing a config file, or using a third party tweaking tool so you cannot blame ubuntu for not copying images it doesnt know about.
The Desktop background image is not the same as the Unity greeter (lightdm) background.