On Thu, Aug 24, 2017 at 11:42:23AM -0700, Kurt Besig wrote:

While using apt-get to update my tor relay to a 'recommended' version I keep encountering this error:

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://deb.torproject.org trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 74A941BA219EC810

W: Failed to fetch http://deb.torproject.org/torproject.org/dists/trusty/InRelease

I've read several approaches to remedying this error, however I'm wondering what would be the 'most widely accepted as correct' method of dealing with the error?

Run the following commands:

gpg --keyserver keys.gnupg.net --recv A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89 gpg --export A3C4F0F979CAA22CDBA8F512EE8CBC9E886DDD89 | sudo apt-key add -

sudo apt-get update sudo apt-get install tor deb.torproject.org-keyring

You can find the instructions for using the repository here: https://www.torproject.org/docs/debian.html.en#ubuntu