Can't install i2p in whonix

Hi, everyone. New to the Forum.

I followed the official guide to getting i2p up and running on whonix.

when i go to do sudo apt update after adding and verifying the keyring i get this:

PG error: tor+https://deb.i2p.net bookworm InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 67ECE5605BCF1346
E: The repository ‘tor+https://deb.i2p.net bookworm 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.

using sudo apt install --no-install-recommends i2p i2p-keyring bring up this error:

his may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package ‘i2p’ has no installation candidate
E: Unable to locate package i2p-keyring

Unspecific to Whonix.

Can be resolved as per:

See also: