Install cl-rosgraph-msgs by entering the following commands in the terminal:
sudo apt update sudo apt install cl-rosgraph-msgs
Messages relating to the Robot OS Computation Graph, LISP bindings
This package is part of Robot OS (ROS). It contains the LISP interface to messages relating to the ROS Computation Graph. Most users are not expected to interact with messages in this package, and it is strongly advised against. These messages are generally wrapped in higher level APIs.