Adding missing PPA keys to an apt keyring

If you are a user of a Linux distribution that takes advantage of Launchpad’s Personal Package Archive, then you know how easy that tool can be for adding those hard to find applications pre-packaged for your system. Once you get used to PPAs, it’s fairly easy to depend upon those repositories. But there is sometimes a, seemingly, insurmountable issue with those PPAs – keys. If the key for a particular PPA isn’t given to you, you can’t use the software — not until the key is added to your keyring.

But how do you add the key when you never

Read more: https://www.ghacks.net/2011/03/31/adding-missing-ppa-keys-to-an-apt-keyring/