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You need to leave out the /opt/ros/electric in your rosinstall call, i.e. you need to call rosinstall like this:

rosinstall ~/ros-py3 http://ias.cs.tum.edu/~kargm/ros_electric_py3.rosinstall

When you have a look at the rosinstall file, you'll see that the first line checks out the stack ros which normally is the ROS_ROOT until Electric. That's why you cannot pass /opt/ros/electric since it provides a second (unpatched) ROS_ROOT.