Looking at the log /var/log/secure showed that it was just downright refused. Here I am using Pierre Schmitz’s public key to sign my iso. Primary key fingerprint: 4AA4 767B BC9C 4B1D 18AE 28B7 7F2D 434B 9741 E8AC gpg: binary signature, digest algorithm SHA1. gameslayer commented on 2020-07-02 10:57. set package-check-signature to nil, e.g. Now verify the signature using the command below. I'm sure there is a simple resolution to this dilemna. License: Creative Commons Attribution 4.0 International License Linux Uprising. After checking this and doing a bit of searching, it turns out PermitRootLogin no needs to be PermitRootLogin without-password if you want to specifically use just keys for root login. M-: (setq package-check-signature nil) RET; download the package gnu-elpa-keyring-update and run the function with the same name, e.g. And even when the key is stolen, the owner can invalidate it by revoking it and announcing it. The person may name the signature-file anything they want: the names of the file and the signature-file do not need to be similar or related. If this happens, when you download his/her public key and try to use it to verify a signature, you’ll be notified that this has been revoked. I'm somewhat new to centos since I'm mainly a debian kind of guy, so I was unaware of /var/log/secure. The registered trademark Linux® is used pursuant to a sublicense from the Linux Foundation, the exclusive licensee of Linus Torvalds, owner of the mark on a worldwide basis. The new key is available from the usual GPG key-servers, comes with Emacs≥26.3, and can also be obtained by installing the package gnu-elpa-keyring-update. If you have not imported someone's Public Key to your GPG Keyring, this procedure does not work. So you can import the public key to your public keyring with: gpg --import VeraCrypt_PGP_public_key.asc. # dpkg-source -x libevent_2.0.12-stable-1.dsc gpgv: Signature made Fri Jun 17 07:12:50 2011 PDT using DSA key ID 7ADF9466 gpgv: Can't check signature: public key not found dpkg-source: warning: failed to verify signature on ./libevent_2.0.12-stable-1.dsc Any idea how to fix this warning? gpg: Can't check signature: public key not found I know I have to import a public key but I don't know where to obtain this file and I've found very little information describing what to do. The signature check failed because you don't have the new key (the old signature key expired on Sep 23). "gpg: Can't check signature: No public key" Is this normal? As you can see, the two fingerprints are identical, which means the public key is correct. M-x package-install RET gnu-elpa-keyring-update RET. gpg: There is no indication that the signature belongs to the owner. gpg: WARNING: This key is not certified with a trusted signature! In the guide to verifying the ISO on the Linux Mint website it does say "Note: Unless you trusted this signature in the past, or a signature which trusted it, GPG should warn you that the signature is not trusted. Forget to actually check the arch one worked or not. This is expected and perfectly normal." ; reset package-check-signature to the default value allow-unsigned; This worked for me. As I understand it, now I need to make sure the public key is valid. How to Verify Signatures Using GnuPG (GPG) The gpg utility is usually installed by default on all distros. As stated in the package the following holds: Have not imported someone 's public key is not certified with a trusted signature signature: no public key not! 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