ubuntu16.04版本安装paddlepaddle-gpu版本，报错信息：

F0726 11:38:23.840427 2200 DynamicLoader.cpp:106] Check failed: nullptr != *dso_handle Failed to find dynamic library: libcudnn.so (libcudnn.so: cannot open shared object file: No such file or directory)
Please specify its path correctly using following ways:
Method. set environment variable LD_LIBRARY_PATH on Linux or DYLD_LIBRARY_PATH on Mac OS.
For instance, issue command: export LD_LIBRARY_PATH=...

环境变量已经设置过，echo $LD_LIBRARY_PATH为/usr/local/cuda/lib64:/usr/local/cuda-9.0/lib64:/usr/local/cuda-9.0/lib:
cuda sample 编译通过，cudnn sample mnistCUDNN编译通过，cuda为9.0版本 cudnn为7.0版本,使用cuda9.2和cudnn7.1报错一样。

python版本为2.7，麻烦解答，谢谢！