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Installing puppet on Ubuntu 24.04 (noble) failed at apt-get update with a GPG error on the apt.puppet.com repo: the Puppet release key (D6811ED3ADEEB8441AF5AA8F4528B6CD9E61EF26) expired on 2025-04-06, so every InRelease signature check failed and the repo was unusable. The key had a hard-coded expiry from 2019. The expiry hit every Ubuntu release using the Puppet repo, since they all shared the same release key.

Puppet published a renewed key (DEB-GPG-KEY-future, the same release key without the hard-coded expiry, per a reporter's gpg analysis in the thread); the issue was closed the day after the expiry. Re-run apt-get update; if your keyring still holds the expired key, re-import the renewed key from https://apt.puppet.com/DEB-GPG-KEY-future into /etc/apt/trusted.gpg.d/ and update again. As an interim workaround only, adding [trusted=yes] to the deb line in /etc/apt/sources.list.d/ bypasses the signature check until the renewed key is in place; remove it afterwards since it disables verification. Source: https://github.com/puppetlabs/puppet/issues/9549

Source: https://github.com/puppetlabs/puppet/issues/9549