Install barbican-keystone-listener by entering the following commands in the terminal:
sudo apt update sudo apt install barbican-keystone-listener
OpenStack Key Management Service - Keystone Listener
The Barbican project provides services for secure storage, provisioning and management of sensitive client secret information such as encryption keys. It is aims at being useful for all environments, including large ephemeral Clouds. . This package contains the Barbican Keystone Listener daemon.