Fixing Ubuntu PPA (Personal Package Archives) Signing Key Issues

My default /etc/apt/sources.list.d/ has around 10-12 PPA listings in it all the time and with the release of 9.04, there doesn't seem to be an automatic way of ignoring authentication for packages on upgrades, so a number of upgrades choke because of unsatisfied authentication issues.

This thread was a lifesaver, download the script, install the dependencies, run it, then re-run sudo apt-get -f update ... problem solved!