error while loading shared libraries: libcudart.so.9.1: cannot open shared object file: No such file

sudo cp /usr/local/cuda-9.1/lib64/libcudart.so.9.1 /usr/local/lib/libcudart.so.9.1 && sudo ldconfig 
sudo cp /usr/local/cuda-9.1/lib64/libcublas.so.9.1 /usr/local/lib/libcublas.so.9.1 && sudo ldconfig 
sudo cp /usr/local/cuda-9.1/lib64/libcurand.so.9.1 /usr/local/lib/libcurand.so.9.1 && sudo ldconfig