Install Numix Theme in Ubuntu 14.04 Trusty/13.10 Saucy/Ubuntu 13.04 Raring/Ubuntu 12.10 Quantal/Ubuntu 12.04 Precise/Linux Mint 15/14/13/other Ubuntu derivatives (GTK + Xfce)

Numix theme is designed by satya164 for GTK, It is kind of flat theme with the combination of dark and light elements. It works perfect with all current GTK versions 3.10/3.8/3.6/3.4, and it support Unity, Gnome, Openbox and also has XFCE theme.
Numix cinnamon theme is inspired by GTK version and it looks same like GTK. Numix cinnamon has two versions, one for bottom panel and other for Top Panel, You can change as per your requirement. It is compatible with all Cinnamon versions.
Awoken icons used in screenshots.
You can use Unity Tweak ToolGnome-tweak-tool or Ubuntu-Tweak to change themes/icons.
numix theme

numix theme

What's new:
  • Support for Client Side Decorations
  • Initial support for GTK3 widgets in Xfce
  • Made the OSD dark in Openbox
  • Backported the mutter theme to metacity
  • Added styles for header bar, app notifications, selection mode & OSD
  • Fixed selection checkboxes in GNOME Documents
  • Lots of fixes and enhancements

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