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Did you remember to set it in the ROS_ROOT file as per the directions?

You have to create a number of files in /etc/ros/env:

ROBOT ROBOT_NAME ROS_ROOT ROS_MASTER_URI ROS_PACKAGE_PATH

From what I can tell, you just have to create each file with that name (you'll need to sudo vi <filename> to create them) and just put a single line containing the value of that variable as the first line... So for my ROS_ROOT, I put: /opt/ros/electric/ros

Hope this helps!