I have the same issue here 20. I tried ln -s /usr/include/cublas_v2.h /usr/local/cuda-10.2/targets/x86_64-linux/include/cublas_v2.h  but I get the output:

ln: failed to create symbolic link '/usr/local/cuda-10.2/targets/x86_64-linux/include/cublas_v2.h': File exists


and my issue is still there. Do you have any solution?