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Ubuntu 12.04 & 13.04

I've loved this post How do I change the wallpaper in LightDM? on how to bind/unbind lightdm to/from user desktop wallpaper.

Although I'd like to know how to do the same with the image that shows behind the "Switch user/Unlock" prompt window. Maybe something related with some hidden feature that shows last logged-in user?

Thanks for ubuntu

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