rtabmap_ros tutorial not working : executable not found

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Hey :-)

System: Ubuntu 16.04

ROS: Lunar (tried Kinetic before) Desktop Full

rtabmap version : 0.13.2

My approach ist to use the rtabmap feature in cooperation with Tango ROS Streamer which is already running fine.

I followed the instructions on this tutorial :

http://wiki.ros.org/rtabmap_ros/Tutor...

At step 6 it fails at this command

rosrun rtabmap_ros pointcloud_to_depthimage cloud:=/tango/point_cloud camera_info:=/tango/camera/color_1/camera_info _fixed_frame_id:=start_of_service _decimation:=8 _fill_holes_size:=5

with the error:

[rosrun] Couldn't find executable named pointcloud_to_depthimage below /opt/ros/lunar/share/rtabmap_ros

I already installed rtabmap via:

sudo apt install ros-lunar-rtabmap-ros

What could go wrong ? -_-

best regards and many thanks in advance for any help

Mark