First, start Ubuntu. Then start Windows.
Open a new terminal and run the following command:
$ roslaunch sigverse_turtlebot2 follower.launch
Start the [Assets/SIGVerse/SampleScenes/Turtlebot2/Turtlebot2Follower(.unity)] scene with reference to here.
When the cross key is operated with the focus on the Windows Unity screen, the avatar moves and TurtleBot2 follows the avatar.
$ rosrun image_view image_view image:=/camera/rgb/image_raw
$ roslaunch turtlebot_rviz_launchers view_robot.launch
When exiting, stop the Unity side before exiting the ROS side.