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For example, apt will remove SHA1 support: Teams/Apt/Sha1Removal - Debian Wiki So we have updated Treasure Agent's GPG key for deb/rpm to drop SHA1 based signing.It means you need to update imported old GPG key before td-agent update.When others find out that your public key has expired, the very first thing they do will be to refresh it from a key server, in which case they’ll retrieve your updated public key.Even if you lose the private key or forget the passphrase or even lose the revocation certificate too, a time will come that the public key will expire, which indicates that it is invalid and should not be trusted any more. In this section I describe how to extend or reset a key’s expiration date using gpg from the command line.The GPG signing key we’ve been using to sign Puppet products on Linux is expiring in January 2017, so we’ve recently switched to a new key.
Done W: GPG error: Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2EA8F35793D8809A @iamcreasy , in order to prove to Ubuntu installations that the packages you are installing are secure and malware free each package is signed by the ubuntu key server.
It lets the holders of the public key know the key’s end-of-life date.
On the other hand, you can always extend the key’s expiration date and send the updated key to the key servers.
Here are three ways you can update to use the new key.
If you’re already setting up your repos using the puppetlabs-release or puppetlabs-release-pc1 packages, this is going to be the easiest way to get the updated key.