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Recently I played a bit on changing lightdm wallpaper... Actually LightDM shows the user wallpaper but not the default guest wallpaper (instead it shows a uniform purple background for guest account). How can I restore it?

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You can try this instruction… – Dmitriy May 26 '12 at 19:50
This worked, However now the guest wallpaper is the same of my account. – Sharaazad May 27 '12 at 19:38

Try running this in the terminal, this will reinstall lightdm, but i am not sure if it resets the configurations: sudo apt-get --reinstall install lightdm

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sudo apt-get remove --purge lightdm
sudo apt-get install lightdm

Maybe you'll not be able to change the background for different users. If you want that, maybe you should log in with the user you want and then use simple-lightdm manager or ubuntu tweak like softwares.

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did not work... – Sharaazad May 27 '12 at 19:39

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