Failed to fetch http://security.ubuntu.com/ubuntu/pool/main/c/cifs-utils/cifs-utils_7.0-2ubuntu0.3_amd64.deb 404 Not Found [IP: 2606:4700:10::6814:1cf6 80]
How to fix
Update Your Repository List
Run the below command to clean cache and update the list of available packages:
sudo apt clean -y
sudo apt update -yThen use the Update Manager, reresh it, and try installing again.
This fixed it for me.