Frames-in-rviz.md

 ### 1. Install the ROS package [agni-tf-tools](http://wiki.ros.org/agni_tf_tools)
 
-`sudo apt install ros-melodic-agni-tf-tools`
+`sudo apt install ros-noetic-agni-tf-tools`
 
 ### 2. Source your ROS environment, and start `roscore` as well as [`rviz`](http://wiki.ros.org/rviz)
 
 ```bash
-source /opt/ros/melodic/setup.bash
+source /opt/ros/noetic/setup.bash
 roscore &
 rosrun rviz rviz
 ```