After installing Gnome Shell and Gnome-Environment from the software central in Ubuntu 12.10 my Ambience and Radiance themes got corrupted.

The problem is now the default theme is Adwaita (in the tweak-gnome-tool) is tells me that Adwait is the default and before was Ambiance. And because of this when I select the theme Ambiance some components of Adwaita persists, specialy top bar windows schemes when widows are not selected (are in the second plane).

Does anyone know how to set Ambience as the default theme again or completly remove Adwaita from Ubuntu 12.10. I deleted the folder from the usr/share/theme directory but Adwaita is still the defaukt theme and are causing problems,

Thanks in advance!