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I am using Ubuntu 11.4 alpha3 for testing. Here I am looking that some of application are removed like Appearance where we play with theme preferences.

How can I change themes in Unity? What is that interface?

During the upgrade process my default Ambiance theme got crupted.

Window decoration are fine but GUI widget (e.g boxes, button, scrollbars) has now Windowish9x look.

How can I restore my default Ambiance theme?

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up vote 4 down vote accepted

Hit <super> (aka the "windows key") and start typing "appearance" (or what ever it is called in your locale). You should find the old Appearance app for tweaking your theme.

Or you can right click on your desktop and select "Change Desktop Background" and select the theme tab to switch themes.

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