Saltstack moved their software repo over to broadcom. You can find out more information here:
https://saltproject.io/blog/salt-project-package-repo-migration-and-guidance/
To fix this manually you can do the following:
sudo rm /usr/share/keyrings/saltstack.gpg
sudo rm /etc/apt/sources.list.d/saltstack.list
To install the new repo:
# Download public key
curl -fsSL https://packages.broadcom.com/artifactory/api/security/keypair/SaltProjectKey/public | sudo tee /etc/apt/keyrings/salt-archive-keyring-2023.pgp
# Create apt repo target configuration
echo "deb [signed-by=/etc/apt/keyrings/salt-archive-keyring-2023.pgp arch=amd64] https://packages.broadcom.com/artifactory/saltproject-deb/ stable main" | sudo tee /etc/apt/sources.list.d/salt.list
We also currently pin our version:
echo 'Package: salt-*
Pin: version 3006.*
Pin-Priority: 1001' | sudo tee /etc/apt/preferences.d/salt-pin-1001