A Problem about ROS Installation Failure

I brushed Jetpack 4.2 on my TX2, and now I want to install ROS on my TX2. Then I install it as follows: https://www.jetsonhacks.com/2017/03/27/robot-operation-system-ros-nvidia-jetson-tx2/

But in the end, when I run the “roscore” command, it will show: bash: roscore: command not found

hi! for error “bash: roscore: command not found”, Don’t forget to make "cd jetsonbot " then “source devel/setup.bash”

Hello! I have Jetson TX2 with Jetpack 4.2 and I installed ROS kinetic from JetsonHacks.com But when I want to setup catkin workspace I got this error:

diego@diego-desktop:~/installROSTX2-vL4T28.2.v2$ ./setupCatkinWorkspace.sh 
./setupCatkinWorkspace.sh: line 5: /opt/ros/kinetic/setup.bash: No such file or directory
Creating Catkin Workspace: /home/diego/catkin_ws
./setupCatkinWorkspace.sh: line 20: catkin_init_workspace: command not found
./setupCatkinWorkspace.sh: line 22: catkin_make: command not found
export ROS_MASTER_URI=http://localhost:11311
export ROS_IP=

Can you help me?