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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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
Ramzi Njeim
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Better:
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.
jasmines
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