After download ISO and try to verify the ISO.sig comes up :

tails-amd64-3.1.iso:Untrusted Valid Signature
Valid but untrusted signature by on 2017-08-09

So what is the play now? How bad is this situation? Should I download it again or it is safe to use it to upgrade my Tails?

  • you better attach full output of the GnuPG here - it will clarify your question. Now it's not 100% clear about what exactly the situation you do have and what to do in such a situation – Alexey Vesnin Aug 10 '17 at 17:24

In cases where you don't understand OpenPGP/GnuPG you're recommended to use one of the non-expert installation methods. OpenPGP is there for experts only, as a non-expert you shouldn't use this installation method.

You can follow an easy to follow step-by-step process using the Tails Installation Guide.

  • I suspect that you've misunderstood the Asker - looks like he knows how to work with GnuPG, but there're some weird output... I think the log will bring the light upon the situation – Alexey Vesnin Aug 12 '17 at 11:04
  • I have not misunderstood the asker and I have provided them with the correct information: "So what is the play now?", to which the correct response is to use one of the alternative installation methods that doesn't involve verification with OpenPGP/GnuPG. – cacahuatl Aug 12 '17 at 21:06

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