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PPAs are great. But, if you try to add third-party sources to your Ubuntu system, you're probably going to get an error about the key used to digitally sign the packages in that PPA. For whatever reason, the keys which are required to sign the software (for verification) are not also automatically nor easily installed by sofware management applications like apt-get or synaptic. They'll probably improve this soon, but in the meantime, this is what you need to know.
It is relatively easy to install these keys (fixing the error message) if you know the right commands. There '''is''' a [HOWTO (https://help.launchpad.net/Packaging/PPA#Adding a PPA to your Ubuntu repositories| HOWTO] ) on the Launchpad site, but I think it's often missed.
I am comfortable with the command-line and it's the quickest solution. Assuming you add the [https://launchpad.net/~gwibber-team Gwibber microblogging client] (where the key id is 5afadbd4aa1c92b0), this is the command sequence: