XBMC: Adding the ppa keys to apt

I recently bought an Acer Aspire Revo and had one of my trainees put XMBC on a SDHC card today. So after a bit of toying earlier, I started looking at the thing (from the command line that is).

One thing, if you enable the PPA (ppa.launchpad.net) sources, apt/aptitude is gonna babble something about an unverified key.

I ended up looking the error up (since I only have an Ubuntu desktop). There’s a simple solution for this:

Alternatively you can also use this: