I agree that it is probably just a temporary problem with the keyserver, but if you are in a hurry, you can download the *.deb file you need from here:

https://launchpad.net/~gezakovacs/+archive/ppa/+packages

Then install it using the following command:

Code:
sudo dpkg -i package_name.deb
You need to either be in the directory where it is located or specify the path to it. you can also use the GDebi Package Installer, found in Menu/System Tools to install it.

Regards,

Didius