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I have been using gnome-shell for a few months. I was able to configure it using "tweak tool" and "background". Now I've just migrated to Unity, but "Change Desktop Background" (comes from right-click on desktop) launches "System Settings". I'm not able to swap desktop wallpaper or change launcher icons' size, etc. As you can see from this picture, the "Appearance" icon has been removed from "System Settings". What's happened to my Ubuntu?

My OS: Ubuntu 12.10; Unity + gnome-shell; latest updates

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marked as duplicate by jokerdino May 13 '13 at 15:00

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

up vote 6 down vote accepted

Try installing these packages in the terminal:

sudo apt-get install gnome-control-center-signon


sudo apt-get install gnome-control-center-unity

That should bring it back.

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