error when run "luarocks install cudnn"

[ivanwu0404]

dear itayhubara,
when i run the command "luarocks install cudnn" it occurs an error:

Installing https://raw.githubusercontent.com/torch/rocks/master/cunn-scm-1.rockspec...
Using https://raw.githubusercontent.com/torch/rocks/master/cunn-scm-1.rockspec... switching to 'build' mode

Missing dependencies for cunn:
cutorch >= 1.0

Using https://raw.githubusercontent.com/torch/rocks/master/cutorch-scm-1.rockspec... switching to 'build' mode
Cloning into 'cutorch'...
remote: Enumerating objects: 229, done.
remote: Counting objects: 100% (229/229), done.
remote: Compressing objects: 100% (184/184), done.
remote: Total 229 (delta 62), reused 90 (delta 43), pack-reused 0
Receiving objects: 100% (229/229), 241.83 KiB | 549.00 KiB/s, done.
Resolving deltas: 100% (62/62), done.
Warning: unmatched variable LUALIB

jopts=$(getconf _NPROCESSORS_CONF)

echo "Building on $jopts cores"
cmake -E make_directory build && cd build && cmake .. -DLUALIB= -DLUA_INCDIR=/home/ivanwu0404/torch/install/include -DCMAKE_CXX_FLAGS=${CMAKE_CXX_FLAGS} -DCMAKE_BUILD_TYPE=Release -DCMAKE_PREFIX_PATH="/home/ivanwu0404/torch/install/bin/.." -DCMAKE_INSTALL_PREFIX="/home/ivanwu0404/torch/install/lib/luarocks/rocks/cutorch/scm-1" && make -j$jopts install

Building on 16 cores
-- The C compiler identification is GNU 7.5.0
-- The CXX compiler identification is GNU 7.5.0
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Torch7 in /home/ivanwu0404/torch/install
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
-- Found CUDA: /usr/local/cuda (found suitable version "10.2", minimum required is "6.5")
-- Removing -DNDEBUG from compile flags
-- TH_LIBRARIES: TH
-- MAGMA not found. Compiling without MAGMA support
-- Autodetected CUDA architecture(s): 7.5
-- got cuda version 10.2
-- Found CUDA with FP16 support, compiling with torch.CudaHalfTensor
-- CUDA_NVCC_FLAGS: -D__CUDA_NO_HALF_OPERATORS__;-gencode;arch=compute_75,code=sm_75;-DCUDA_HAS_FP16=1
-- THC_SO_VERSION: 0
-- Performing Test HAS_LUAL_SETFUNCS
-- Performing Test HAS_LUAL_SETFUNCS - Success
CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
CUDA_cublas_device_LIBRARY (ADVANCED)
linked by target "THC" in directory /tmp/luarocks_cutorch-scm-1-2427/cutorch/lib/THC

-- Configuring incomplete, errors occurred!
See also "/tmp/luarocks_cutorch-scm-1-2427/cutorch/build/CMakeFiles/CMakeOutput.log".
See also "/tmp/luarocks_cutorch-scm-1-2427/cutorch/build/CMakeFiles/CMakeError.log".

Error: Failed installing dependency: https://raw.githubusercontent.com/torch/rocks/master/cutorch-scm-1.rockspec - Build error: Failed building.

i know one solution to problem is installing cuda toolkit, and i already installed it, but there still have same error.
Can you help me fixing it?
My cuda version is 10.2
i'm using ubuntu 18.04