HOME
The default home directory.
pgp-fixkey [keyid [keyid ...]]pgp-fixkey removes broken packets from keys in the GnuPG keyring that make GnuPG spew ugly warnings. It optionally takes a list of keyids on the command line and only cleans those keys.
Use this key.
HOME
The default home directory.
GNUPGBIN
The gpg binary. Default: "gpg".
GNUPGHOME
The default working directory for gpg. Default: "$HOME/.gnupg".
$HOME/.gnupg/pubring.gpg - default GnuPG keyring
11 releases since Debian 4.0 (Etch); the text changed 9 times.