Hit:1 tor+https://devrepo.subgraph.com/subgraph aaron InRelease
Err:1 tor+https://devrepo.subgraph.com/subgraph aaron InRelease
The following signatures were invalid: EXPKEYSIG E1AE39C4F999D968 Subgraph Release Signing Key <release@subgraph.com>
Hit:2 http://security.debian.org/debian-security stretch/updates InRelease
Hit:3 https://updates.signal.org/desktop/apt xenial InRelease
Ign:4 http://cdn-fastly.deb.debian.org/debian stretch InRelease
Hit:5 http://cdn-fastly.deb.debian.org/debian stretch Release
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: tor+https://devrepo.subgraph.com/subgraph aaron InRelease: The following signatures were invalid: EXPKEYSIG E1AE39C4F999D968 Subgraph Release Signing Key <release@subgraph.com>
W: Failed to fetch tor+https://devrepo.subgraph.com/subgraph/dists/aaron/InRelease The following signatures were invalid: EXPKEYSIG E1AE39C4F999D968 Subgraph Release Signing Key <release@subgraph.com>
W: Some index files failed to download. They have been ignored, or old ones used instead.
Today, when I ran:
sudo apt-get update
I got: