In the Ubuntu (Debian) packaging world of Apt, the use of
apt-key has been deprecated (other than
apt-key del to remove keys).
I’ve run into errors like the following periodically, and have had to spend more time than I should reminding myself of how to fix the issue:
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://apt.releases.hashicorp.com jammy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY DA418C88A3219F7B