First edit /etc/apt/sources.list file
gksudo gedit /etc/apt/sources.list
add the following lines
deb http://ppa.launchpad.net/bisigi/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/bisigi/ppa/ubuntu karmic main
Save and exit the file
add the GPG key using the following command
gpg –keyserver hkp://keyserver.ubuntu.com:11371 –recv-key 881574DE && gpg -a –export 881574DE | sudo apt-key add -
Or simply use the following command
sudo add-apt-repository ppa:bisigi
Update the source list using the following command
sudo aptitude update
Install all the themes using the following command
sudo aptitude install zgegblog-themes
or click on the following link
apt://zgegblog-themes
Showtime for Gnome