How to add PPA software sources in Ubuntu 10.04 'Natty'

When adding PPA sources to Ubuntu it's no longer enough to just add the source in update-manager or package manager, because the GPG key does not get loaded. Instead, open a terminal window and enter the following:

sudo add-apt-repository 

If that fails to load the GPG key, follow these additional steps:

On the PPA Web Page, there’s a heading called ‘Technical Details for this PPA’, click it to expand it, under ‘Signing Key’ there’s a hyper-linked key, click the link, and then the link on the next page, and you reach a page showing the GPG key for the PPA. Save the text from -----BEGIN PGP PUBLIC KEY BLOCK----- to -----END PGP PUBLIC KEY BLOCK-----
in a text file.

In Ubuntu go to System|Administration|Update Manager|Settings|Authentication|Import Key File… and choose the text file you just created. Then press the Close button, then the Check button, and now Install Updates should now work without problems

Thank you very much to http://cdivilly.wordpress.com/2011/02/16/ubuntu-personal-package-archives-proxies-and-update-manager/ for these steps.

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