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I have a Debian 9.3 OS on my computer. I have downloaded Ubuntu 18.04 LTS ISO image, which I want to run as a "live CD". However, before I burn it, I would like to verify it.

I try to follow directions on verification given by this tutorial.

When I come to step #4, Retrieve the correct signature key, and run

gpg --verify SHA256SUMS.gpg SHA256SUMS

in the terminal, I get:

gpg: can't open 'SHA256SUMS.gpg': No such file or directory
gpg: verify signatures failed: No such file or directory

According to the instructions provided, I should have gotten an error message with some keys, such as:

gpg: Signature made Thu Apr  5 22:19:36 2018 EDT using DSA key ID FBB75451
gpg: Can't check signature: No public key
gpg: Signature made Thu Apr  5 22:19:36 2018 EDT using RSA key ID EFE21092
gpg: Can't check signature: No public key

But I don't get this. So, I don't know how to proceed with verification.

marked as duplicate by karel, Terrance, N0rbert, pomsky, Kevin Bowen Jul 2 '18 at 18:12

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