Error when trying to run cuda, libcudart.so.9.0 not found.

Accelerated Computing CUDA CUDA Setup and Installation
1

When I try to run a cuda program, I get import error for libcudart.so.9.0

when I ran locate libcudart.so , I get

/usr/local/cuda-9.0/doc/man/man7/libcudart.so.7
/usr/local/cuda-9.0/lib64/libcudart.so
/usr/local/cuda-9.0/lib64/libcudart.so.9.0
/usr/local/cuda-9.0/lib64/libcudart.so.9.0.176
/usr/share/man/man7/libcudart.so.7

I checked my paths and updated them as below. The error still occurs.

$ echo $PATH
/home/ash/bin:/home/ash/.local/bin:/home/ash/bin:/home/ash/.local/bin:/usr/local/sbin:/snap/bin:/usr/local/cuda-9.0/bin

$ echo $LD_LIBRARY_PATH
/usr/local/cuda-9.0/lib64

I am using cuda-9.0 on ubuntu-16.04. I installed it with

sudo apt-get install cuda-9.0

Is there any problem with my installation?