Disable removed GPG key
Used when we want to disable a key that has been removed from the keyring, e.g. when keyring-maint removes a revoke key.
In that case the system prevent anybody from changing the fingerprint, including FD. Also doing the change from the admin interface is a pain due to the separation of the
Fingerprint model from the
The attached line of code can be used in the Django shell to conveniently do it.