How to add themes to ubuntu(linux)

 

First find theme u like from internet like this site has lots of free and paid themes for ubuntu http://www.ubuntuthemes.org/ 

No extra downloaded third party software is needed.

For gnome shell, you can install the gnome-tweak-tool:

sudo apt-get install gnome-tweak-tool

For Ubuntu unity, you can either install the gnome-tweak-tool or you can use the unity-tweak-tool to change themes:

sudo apt-get install unity-tweak-tool

Download and extract all themes to your ~/.themes directory. Run the following command to create this directory:(if doesnt exist already)

mkdir ~/.themes

This directory is hidden, so you must press CTRL + H after you open nautilus(file manager)  to display hidden files if the directory is not displayed.

Once the theme has been downloaded and extracted to your ~/.themes directory, open either gnome-tweak-tool or unity-tweak-tool to select the theme.