Apt/apt-get Cuda install fail due to 404

Accelerated Computing CUDA CUDA Setup and Installation
, ,
1

I am following this guide to install Cuda toolkit. I am installing in WSL2 using Ubuntu on x86-64 hardware.

When I enter the command:

$ sudo apt-get -y install cuda

I get the following errors:

Err:7 http://security.ubuntu.com/ubuntu focal-updates/main amd64 libnss3 amd64 2:3.49.1-1ubuntu1.8
  404  Not Found [IP: 91.189.91.39 80]
Err:8 http://security.ubuntu.com/ubuntu focal-updates/main amd64 openjdk-11-jre-headless amd64 11.0.17+8-1ubuntu2~20.04
  404  Not Found [IP: 91.189.91.39 80]
Err:9 http://security.ubuntu.com/ubuntu focal-updates/main amd64 openjdk-11-jre amd64 11.0.17+8-1ubuntu2~20.04
  404  Not Found [IP: 91.189.91.39 80]
.
.
.
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/n/nss/libnss3_3.49.1-1ubuntu1.8_amd64.deb  404  Not Found [IP: 91.189.91.39 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjdk-lts/openjdk-11-jre-headless_11.0.17+8-1ubuntu2~20.04_amd64.deb  404  Not Found [IP: 91.189.91.39 80]
E: Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/o/openjdk-lts/openjdk-11-jre_11.0.17+8-1ubuntu2~20.04_amd64.deb  404  Not Found [IP: 91.189.91.39 80]
E: Unable to fetch some archives, maybe run apt-get update or try with --fix-missing?

It throws the same error if I use apt and adding the --fix-missing argument to either nets the same result. Have these files been moved/updated?