Cara Instalasi:
sudo add-apt-repository ppa:upubuntu-com/themes
sudo apt-get update
sudo apt-get install radiance-dark-panel
Aktifkan dengan perintah:
gsettings set org.gnome.desktop.interface gtk-theme 'Radiance-Dark-Panel'
gconftool-2 --set --type string /apps/metacity/general/theme 'Radiance-Dark-Panel'
Sumber: http://www.upubuntu.com/2012/07/get-dark-panel-with-radiance-theme-for.html