Troubleshooting

Fail to install the repository certificate

If you getting the error:

gpg: no valid OpenPGP data found.

Try to download the hermes.key file directly from https://debian.hermes.radio/hermes/hermes.key by just clicking on the link or via CLI with:

wget https://debian.hermes.radio/hermes/hermes.key

Then run cat hermes.key command to check the content of the file, it should start with -----BEGIN PGP PUBLIC KEY BLOCK-----

If the hermes.key downloaded file is correct you can try:

cat hermes.key | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/hermes.gpg

Note: Installation via Debian package requires Debian 13 (Trixie), if you have different version follow the steps on Install via official GitHub repository on Linux