Useful Commands
List secret keys
gpg -k
Delete a private key
gpg --delete-secret-key "User Name"
Delete a public key
gpg --delete-key "User Name"
Backup the gpg keys
gpg2 --export-secret-keys > secret.gpg
Restore the gpg keys
gpg2 --import secret.gpg
gpg --edit-key <KEY_ID>
gpg>trust
enter '5'