In this guide we will help you change GTK themes, icon themes, and window decoration themes using two methods. The first method consists of using Dconf-Tools, the second consists of using the terminal.
Open the terminal (Ctrl+Alt+T) and run this command to install Dconf-Tools:
sudo apt-get install dconf-tools
Then start it via the Unity dash:
Method 1: Changing GTK Theme and Icon Theme using Dconf-Tools
Launch Dconf-Tools and head to org > gnome > desktop > interface, and on the right pane of the window, locate the following entries:
gtk-theme ---> Displays the current used GTK theme
icon-theme ---> Displays the current used icon theme
Rename them to any other theme folder name as displayed in the following folders:
/usr/share/themes ---> contains all installed GTK themes
/usr/share/icons ---> contains all installed icon themes
Changes are instantaneous, no need to reboot.
Method 2: Changing GTK Theme, Icon Theme & Window Decoration Theme Via The Terminal
1. Changing The GTK Theme
Open the terminal and run this command to change the GTK theme:
gsettings set org.gnome.desktop.interface gtk-theme 'Theme_Name'
Replace "Theme_Name" with the name of the theme you want to use. To use, for example the Radiance theme, run this command:
gsettings set org.gnome.desktop.interface gtk-theme 'Radiance'
2. Changing The Icon Theme
To change the icon theme, use this command:
gsettings set org.gnome.desktop.interface icon-theme ''Theme_Name'
3. Changing The Window Decoration Theme
To change the window decoration theme, run this command:
gconftool-2 --set --type string /apps/metacity/general/theme 'Theme_Name'