Install Simplex theme in Ubuntu 12.10 Quantal/Ubuntu 12.04 Precise/Linux Mint 14/13 (GTK + Gnome Shell, Cinnamon, OpenBox, Xfwm4)
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no terminal digite estes comandos no terminal
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sudo add-apt-repository ppa:noobslab/themes

sudo apt-get update

sudo apt-get install simplex