Cudnn v8 download error

For ubuntu 20.04 the command

sudo apt-get install libcudnn-samples=


E: Unable to locate package libcudnn-samples

How can I determine the correct download name ? According to the documentation, this format is correct.


Could you please try as step 7 in the following installation guide.

Command should be sudo apt-get install libcudnn8-samples=8.x.x.x-1+cudaX.Y.
Please make sure you run before commands as well.

Thank you.