Unclear OpenPGP verification instructions for Linux

In our verification process instructions, before doing the “gpg —verify” commandline, people are asked to:

1. Download the Tails signing key.

And maybe this should be rephrased this way:

1. Download and import the Tails signing key in your keyring.

Because many people then get a “gpg: error reading key: public key not found” error afterward.

Original created by @mercedes508 on 16175 (Redmine)

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