Docker Installation Error: Unable to Connect to download.docker.com

It looks like there is an issue connecting to the 'download.docker.com' server. This could be caused by a few different factors, such as network connectivity issues or a problem with the server itself.

Here are a few things you can try to troubleshoot the issue:

1. Check your network connection. Make sure you are connected to the internet and that there are no issues with your network.

2. Check the 'download.docker.com' server status. You can use a website like https://www.isitdownrightnow.com/download.docker.com.html to check if the server is currently down or experiencing issues.

3. Try downloading the package manually. If you are still having issues with the package, you can try downloading it manually from the Docker website and installing it using the command line. Here are the steps:

• Go to https://download.docker.com/linux/ubuntu/dists/focal/pool/stable/amd64/
• Find the 'docker-ce-cli' package you need (in this case, 'docker-ce-cli_23.0.3-1~ubuntu.20.04~focal_amd64.deb').
• Download the package to your local machine.
• Install the package using the command line: sudo dpkg -i /path/to/package.deb

Hopefully one of these solutions will help you resolve the issue and successfully install the 'docker-ce-cli' package.