Solución couldn't be verified because the public key is not available: NO_PUBKEY
02 de Febrero de 2023 por David Guillermo

Reading package lists... Done
W: GPG error: https://repos.influxdata.com/debian bullseye InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D8FF8E1F7DF8B07E
E: The repository 'https://repos.influxdata.com/debian bullseye InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
Bueno, ya que la solución habitual no vale, acabo de hacerlo de la siguiente manera.