---
tags: tutorial, cuda, cudnn
---
# Ubuntu 18.04 CUDA/cuDNN Installation

## Step 1. Remove older version of CUDA/CuDNN

- Go to `/usr/local/` see if there are any `cuda-x.x` folder. Then remove it with:

    sudo rm -rf /usr/local/cuda-x.x/

## Step 2. Install CUDA

- Download from https://developer.nvidia.com/cuda-toolkit
Choose the way with your environment,
last step choose `deb(local)`

- Follow the instruction
In this time, like this:

    wget https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/cuda-ubuntu1804.pin
    sudo mv cuda-ubuntu1804.pin /etc/apt/preferences.d/cuda-repository-pin-600
    wget https://developer.download.nvidia.com/compute/cuda/11.2.2/local_installers/cuda-repo-ubuntu1804-11-2-local_11.2.2-460.32.03-1_amd64.deb
    sudo dpkg -i cuda-repo-ubuntu1804-11-2-local_11.2.2-460.32.03-1_amd64.deb
    sudo apt-key add /var/cuda-repo-ubuntu1804-11-2-local/7fa2af80.pub
    sudo apt-get update
    sudo apt-get -y install cuda

- After installation complete, add below `PATH` variable to the shellrc you use:
https://docs.nvidia.com/cuda/cuda-installation-guide-linux/index.html#mandatory-post

    export PATH=/usr/local/cuda-11.2/bin${PATH:+:${PATH}}
    export LD_LIBRARY_PATH=/usr/local/cuda-11.2/lib64\${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}
    export LD_LIBRARY_PATH=${LD_LIBRARY_PATH}:/usr/local/cuda/targets/x86_64-linux/lib

- CUDA installed

## Step 3. Install CuDNN

Official Installation Guide: https://docs.nvidia.com/deeplearning/cudnn/install-guide/index.html#installlinux
- Download from https://developer.nvidia.com/rdp/cudnn-archive

Select the support version of CUDA (this time I used is CUDA11.2 & cuDNN8.1.0)
Choose `cuDNN Library for Linux(x86_64)`

- After downloaded, extract it and copy to the right place

    tar -xzvf cudnn-x.x-linux-x64-v8.x.x.x.tgz
    sudo cp cuda/include/cudnn*.h /usr/local/cuda/include 
    sudo cp -P cuda/lib64/libcudnn* /usr/local/cuda/lib64 
    sudo chmod a+r /usr/local/cuda/include/cudnn*.h /usr/local/cuda/lib64/libcudnn*

- Verify Version

    cat /usr/local/cuda/include/cudnn_version.h | grep CUDNN_MAJOR

- cuDNN installed