Why do I get "/sbin/ldconfig.real: /usr/local/cuda/lib64/libcudnn.so.7 is not a symbolic link"?

After installing CUDA toolkit and cuDNN successfully without any issues, whenever I do :

sudo ldconfig 

I get the :

/sbin/ldconfig.real: /usr/local/cuda/lib64/libcudnn.so.7 is not a symbolic link

error message.
what is the reason and how can I resolve this?

By the way, I have installed cuDNN like this :

 # cuDNN, extracts to a folder named cuda tar xvf cudnn*.tgz   cd cuda   sudo cp lib64/* /usr/local/cuda/lib64 sudo cp include/* /usr/local/cuda/include

The output of ls -lha libcudnn* in /usr/local/cuda/lib64 is as follows:

breeze@breeze:/usr/local/cuda/lib64$ ls -lha libcudnn*-rwxr-xr-x 1 root root 275M آوریل 15 12:03 libcudnn.so-rwxr-xr-x 1 root root 275M آوریل 15 12:03 libcudnn.so.7-rwxr-xr-x 1 root root 275M آوریل 15 12:03 libcudnn.so.7.0.5-rw-r--r-- 1 root root 268M آوریل 15 12:03 libcudnn_static.a