OS & Tools/Error

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

전두선 2020. 2. 26. 20:00

This may happen when you run sudo ldconfig after copying cuDNN files.

After installing cuDNN, copying the extracted files to /usr/lib/cuda/lib64 and creating the symlinks, things may go wrong with the symlinks.

So go to /usr/local/cuda/lib64/ and run ls -lha libcudnn*

You should see two symlinks (bold teal) and one single file. Something like this:

The exact version of libcudnn.so.5.1.5 maybe be a little different for you (maybe libcudnn.so.5.1.10). In that case, adapt the code accordingly


/usr/local/cuda/lib64$ ls -lha libcudnn*
lrwxrwxrwx 1 root root 13 Dez 25 23:56 libcudnn.so -> libcudnn.so.5
lrwxrwxrwx 1 root root 17 Dez 25 23:55 libcudnn.so.5 -> libcudnn.so.5.1.5
-rwxr-xr-x 1 root root 76M Dez 25 23:27 libcudnn.so.5.1.5

If libcudnn.so and libcudnn.so.5 are not symlinks then this is the reason why you got this error. If so, this is what you need to do:


/usr/local/cuda/lib64$ sudo rm libcudnn.so
/usr/local/cuda/lib64$ sudo rm libcudnn.so.5
/usr/local/cuda/lib64$ sudo ln libcudnn.so.5.1.5 libcudnn.so.5
/usr/local/cuda/lib64$ sudo ln libcudnn.so.5 libcudnn.so

Run sudo ldconfig again and there should be no errors