According to wikipedia Ubuntu is a Debian-based Linux operating system, with Unity as its default desktop environment. It is based on free software and named after the Southern African philosophy of Ubuntu (literally, “human-ness”), which often is translated as “humanity towards others” or “the belief in a universal bond of sharing that connects all humanity”. Ubuntu is world’s most popular OS for its GUI. In simple Linux operating system you can not high GUI as Ubuntu. You can get free CD of Ubuntu Desktop or Server edition from Ubuntu.com official site.
Today we come with Freebie for people who love Ubuntu. We are sharing both ambiance and radiance desktop appearances for latest Ubuntu Release. If you are designer and want to develop own small GUI app you can free to use this Ubuntu GUI kit. You can get awesome set of Icons , buttons, sidebars, switches, progress bar, check boxes, sliders, bread crumbs and tool tips with pixel perfect design. You can get fully editable 4 PSD file. Please read usage license before use it.
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Original Resource http://www.designshock.com/ubuntu-template/