Possible Duplicate:
How do I create a desktop wallpaper slideshow?

I updated Ubuntu on my computer and I seen, that there is a daily changing option in background menu, but I can't set my own pictures/wallpapers as changing background. I typed "gsku nautilus", copied my wallpapers to the /usr/share/backgrounds, but I haven't seen my wallpapers at the setup menu.

Can anybody type it, how to set my own wallpapers as changing backgrounds? (I'm a beginner.) Thank you!

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