By far the simplest way to handle this now is with Y-PPA-Manager (which now integrates the launchpad-getkeys
script with a graphical interface).
To install it, first add the webupd8 repository for this program:
sudo add-apt-repository ppa:webupd8team/y-ppa-manager
Update your software list and install Y-PPA-Manager:
sudo apt-get update sudo apt-get install y-ppa-manager
Run y-ppa-manager (i.e. type
y-ppa-manager
then press enter key).