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This question already has an answer here:

I need to change the background of my desktop in Ubuntu 12. 04 with a command in terminal, in order to make a script with bash. Does anyone know how to do it?

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marked as duplicate by Oli♦ Nov 21 '13 at 13:20

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up vote 16 down vote

Run the following command in Terminal 

gsettings set org.gnome.desktop.background picture-uri file:///path/to/your/image.png

This will change the Desktop Background to image.png.

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