OSError: libbcm_host: cannot open shared object file: No such file or directory

When I try to use image[ubuntu:armhf] to control sensors in rancheros , I can use GPIO to control the sensor.

However, when I use the python module: picamera to control the Human body induction sensor sensor, it is wrong.The wrong message is: OSError: libbcm_host: cannot open shared object file: No such file or directory.

I have downloaded libbcm_host.so from GitHub and copied it to /usr/local/lib and /usr/lib, but still report the same error. I need help. Thanks.:slightly_smiling_face::slightly_smiling_face::slightly_smiling_face: