how install robot-pose-ekf kinetic

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Hi

how to install the Robot-pose-ekf package in kinetic.

An error occurs with the apt-get install command:

After this operation, 2.653 kB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Err:1 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-bfl amd64 0.7.0-2xenial-20180809-134309-0800
  404  Not Found [IP: 64.50.233.100 80]
Err:2 http://packages.ros.org/ros/ubuntu xenial/main amd64 ros-kinetic-robot-pose-ekf amd64 1.14.4-0xenial-20190320-162431-0800
  404  Not Found [IP: 64.50.233.100 80]
E: Failed to fetch http://packages.ros.org/ros/ubuntu/pool/main/r/ros-kinetic-bfl/ros-kinetic-bfl_0.7.0-2xenial-20180809-134309-0800_amd64.deb  404  Not Found [IP: 64.50.233.100 80]

E: Failed to fetch http://packages.ros.org/ros/ubuntu/pool/main/r/ros-kinetic-robot-pose-ekf/ros-kinetic-robot-pose-ekf_1.14.4-0xenial-20190320-162431-0800_amd64.deb  404  Not Found [IP: 64.50.233.100 80]

E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

I've already run the apt-get update command...