Help with CUDA Installation

[SuperLuckyKris]

Hi,

I'm having trouble installing CUDA following the steps provided on GitHub. I am using Ubuntu 18.04, and here is the command I executed along with the error message I received:
sudo apt-get -o Dpkg::Options::="--force-overwrite" install cuda-11-1 cuda-drivers
Error message:
E: Unable to locate package cuda-11-1
E: Unable to locate package cuda-drivers
I also checked the /etc/apt/sources.list.d/cuda.list file, and its content is:
deb https://developer.download.nvidia.com/compute/cuda/repos/ubuntu1804/x86_64/
Could you please advise me on how to resolve this issue? Thank you for your help!