Hi Matt. This cmd could help, give it a try sudo apt-key adv --recv-keys --keyserver keys.gnupg.net YOURMISSINGKEY Best regards, volker 😊 Von: tor-relays <tor-relays-bounces@lists.torproject.org> Im Auftrag von tor Gesendet: Mittwoch, 3. Februar 2021 18:17 An: tor-relays@lists.torproject.org Betreff: [tor-relays] Sig ver error Hi all, I'm getting a signature verification error: $ sudo apt-get update Hit:1 <http://mirrordirector.raspbian.org/raspbian> http://mirrordirector.raspbian.org/raspbian stretch InRelease Hit:2 <http://archive.raspberrypi.org/debian> http://archive.raspberrypi.org/debian jessie InRelease Get:3 <https://deb.torproject.org/torproject.org> https://deb.torproject.org/torproject.org stretch InRelease [3528 B] Err:3 <https://deb.torproject.org/torproject.org> https://deb.torproject.org/torproject.org stretch InRelease The following signatures were invalid: EXPKEYSIG 74A941BA219EC810 <http://deb.torproject.org/> deb.torproject.org archive signing key Fetched 3528 B in 3s (998 B/s) Reading package lists... Done W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: <https://deb.torproject.org/torproject.org> https://deb.torproject.org/torproject.org stretch InRelease: The following signatures were invalid: EXPKEYSIG 74A941BA219EC810 <http://deb.torproject.org/> deb.torproject.org archive signing key W: Failed to fetch <https://deb.torproject.org/torproject.org/dists/stretch/InRelease> https://deb.torproject.org/torproject.org/dists/stretch/InRelease The following signatures were invalid: EXPKEYSIG 74A941BA219EC810 <http://deb.torproject.org/> deb.torproject.org archive signing key W: Some index files failed to download. They have been ignored, or old ones used instead. Any thoughts would be appreciated. thanks, matt