Bureaucrats, confirmed, Administrators
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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) 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 proper command sequence:
<source lang="bash">
sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 5afadbd4aa1c92b0
</source>
"sudo" means that you will be prompted to enter you're system account password to execute the command as the super-user.
== Note ==
If you are more comfortable with graphical tools, then see the help.launchpad.net site where it walks you through those steps.
== See Also ==
[[Using keys]] describes more about using SSH and key authentication
[[Category:Help]]
[[Category:Applications]]
[[Category:System Administration]]
[[Category:Security]]