Ubuntu 20.04 CUDA & cuDNN Installation Method (Graphical Tutorial)

CUDA installation download cuda

Enter the nvidia-smi command to view the supported cuda version

If you cannot view it, it means that the nvidia driver has not been installed. Click Additional Driver, select the corresponding version of the driver and it will be automatically downloaded.

Download the corresponding version of cuda from https://developer.nvidia.com/cuda-toolkit-archive and select the 18.04 version.

gcc downgrade

The gcc version that comes with Ubuntu 20.04 is 9.7.0. You need to add gcc7 to install cuda10.2. Enter the command to install gcc7

apt-get install gcc-7 g++-7

Check the gcc version and you can see that there are two versions, 7 and 9, in the system.

Use update-alternatives to switch versions and enter the following command:

sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-7 100
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 50

At this time, enter the sudo update-alternatives --config gcc command to view the default version of gcc. You can see that the current default gcc version is 7, which means the switch is successful.

Install CUDA

Enter the command to install

sudo sh cuda_10.2.89_440.33.01_linux.run 

Click continue

Enter accept

The cuda installation package comes with its own graphics driver, so in this step, press the space bar to remove the option to install the graphics driver, and then select install

Configuring environment variables

Enter the gedit ~/.bashrc command to open the file, enter the following statement at the end of the file, and save it.

export PATH=/usr/local/cuda-10.2/bin${PATH:+:${PATH}}
export LD_LIBRARY_PATH=/usr/local/cuda-10.2/lib64${LD_LIBRARY_PATH:+:${LD_LIBRARY_PATH}}

Update environment variable configuration

source ~/.bashrc

At this point, the cuda installation is complete. Enter the nvcc -V command to view the cuda information

Install cuDNN

Download the corresponding version of cudnn from https://developer.nvidia.com/cudnn. You need to log in.

After downloading and decompressing, copy the cuda/include/cudnn.h file to the usr/local/cuda/include folder, copy all files under cuda/lib64/ to the /usr/local/cuda/lib64 folder, and add read permissions:

sudo chmod a+r /usr/local/cuda/include/cudnn.h /usr/local/cuda/lib64/libcudnn*

At this point, cuDNN installation is complete

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