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3

You can use Y-PPA manager: To solve this install y-ppa-manager.To install open terminal and run: sudo add-apt-repository ppa:webupd8team/y-ppa-manager sudo apt-get update sudo apt-get install y-ppa-manager Explanation: command 1: Adds PPA command 2 and 3: update and install y-ppa manager. Now run y-ppa-manager from terminal. When main y-ppa-manager ...


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Open terminal and run: The proper way to add missing keys (here AE0A77A7BFF792D0) gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv AE0A77A7BFF792D0 which retrieves the key from ubuntu key server and then gpg --export --armor AE0A77A7BFF792D0 | sudo apt-key add - which adds the key to apt trusted keys. The following command also do the same but it ...


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One may try launchpad-getkeys. Delete all the contents in /etc/apt/trusted.gpg.d/. Add $ sudo add-apt-repository ppa:nilarimogard/webupd8 repository sudo apt-get update your local database Install $ sudo apt-get install launchpad-getkeys Run $ sudo launchpad-getkeys Check $ sudo apt-get update if the error is gone.


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There is no PGP/GPG support for now, but a feature request already has been filed, you can mark that it affects you as well: https://bugs.launchpad.net/pantheon-mail/+bug/1517988 You might want to post a bounty as well: https://www.bountysource.com/issues/1353854-transparent-encryption-and-signing-with-gpg


1

elementary OS signs its distribution iso, cf. https://elementary.io/docs/installation#verify-your-download (for elementary OS 0.4 (loki) they used sha256sum) For older elementary versions you should check: How to verify the downloaded .iso file?


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