Cannot install Install erratic_robot stack

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I followed the instructions form http://wiki.ros.org/simulator_gazebo/... . But I failed at the first step when I try to install using

sudo apt-get install ros-diamondback-erratic-robot

The error is

E: 无法定位软件包 ros-diamondback-erratic-robot

In English the error is

E: can not locate software package ros-diamondback-erratic-robot.

My operation system is Ubuntu 16.04 and I have installed ROS-kinetic. Can anyone give me some suggestions. Thank you.