In this tutorial, we will see two nice GTK3 themes for Unity and Gnome Shell desktop environments: G3-Pro (GTK3.6 only) & Dorian. These themes can be installed in Ubuntu 12.10 or Linux Mint 14. To make their installation easier, we've added them to our PPA as given below. Here are some screenshots for the two themes on Ubuntu:
Dorian (Dark)
Installing Themes
First add our PPA using these two commands:
sudo add-apt-repository ppa:upubuntu-com/gtk+3.6
sudo apt-get update
Install now G3-Pro with this command:
sudo apt-get install g3-pro-theme
For Dorian, enter this command:
sudo apt-get install dorian-theme
NOTE: You can use GNOME TWEAK TOOL to enable these two themes or use any of your favorite software.
Uninstalling Themes
To remove these themes from your system, enter these commands:
sudo apt-get remove g3-pro-theme
sudo apt-get remove dorian-theme
sudo add-apt-repository --remove ppa:upubuntu-com/gtk+3.6
sudo apt-get update