The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C

Ubuntu 23.10 Mantic

Error started after upgrading Ubuntu to Mantic.

Err:2 https://brave-browser-apt-release.s3.brave.com stable InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: https://brave-browser-apt-release.s3.brave.com stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C
W: Failed to fetch https://brave-browser-apt-release.s3.brave.com/dists/stable/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A8580BDC82D3DC6C
W: Some index files failed to download. They have been ignored, or old ones used instead.

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