Install Smoothly Light + Dark theme on Ubuntu 13.04 Raring/Ubuntu 12.10 Quantal/Ubuntu 12.04 Precise/Ubuntu 11.10 Oneiric/Linux Mint 15/14/13/12 (GTK theme)

Smoothly theme is designed for GTK and avialable in two versions smoothly-dark and smoothly light, It is available for GTK 3.8/3.6/3.4/3.2 version. Smoothly (Black) GTK-3.4 requires unico-1.0.2 and adwaita themes engine and Smoothly GTK-3.2 requires unico-1.0.1 themes engine in order to use them.
smoothly theme
smoothly gtk
Theme tested on Ubuntu 13.04 Raring/12.10 Quantal/12.04 Precise
zonColor Wallpapers used in screenshots, Also checkout Black Wallpapers
Nitrux-Icons used in screenshots, Also checkout icons collection
You can use Unity Tweak ToolGnome-tweak-tool or Ubuntu-Tweak to change themes.

To install Smoothly theme on Ubuntu/Linux Mint open Terminal (Press Ctrl+Alt+T) and copy the following commands in the Terminal:
That's it
Source: Smoothly
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