roscd finds ros_gazebo_pkgs but rospack find don't
I have installed ROS Lunar in an Ubuntu 16.04.4.
I'm trying to find I package. With roscd I find it, but with rospack find don't.
user@MyPC:~$ roscd gazebo_ros_pkgs
user@MyPC:/opt/ros/lunar/share/gazebo_ros_pkgs$ rospack find gazebo_ros_pkgs
[rospack] Error: package 'gazebo_ros_pkgs' not found
I have tried with roscpp, and both find it:
user@MyPC:~$ roscd roscpp
user@MyPC:/opt/ros/lunar/share/roscpp$ rospack find roscpp
/opt/ros/lunar/share/roscpp
Is gazebo_ros_pkgs not installed properly?