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Having the exact same issue on Ubuntu 14.10/GNOME 3.12. useGpgAgent was already set to false for me (in fact I didn't have have GpgAgent installed until just now) and my system is fully upgraded, so I'm afraid smCaterpillar's solution won't help me. I've deleted the public and private keys from .gnupg, set useGpgAgent and useGpgKeytools to their respective ...


I had the same problem with DynDNS's Updater client. Turns out it was just expired keys. Reinstalling the software (downloading a new .deb from the website, then using Software Centre to Reinstall) fixed the problem. Error message for reference: W: GPG error: http://cdn.dyn.com stable/ Release: The following signatures were invalid: KEYEXPIRED ...

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