Like clean, but only removes package files that can no longer be downloaded

apt autoclean

For any operation that would download packages, download them, but do nothing else

Do not download packages, attempt to use already downloaded packages

--no-download

Simulate running this command and show it's output, without actually changing anything

Name	Description
`-d, --download-only`	For any operation that would download packages, download them, but do nothing else
`--no-download`	Do not download packages, attempt to use already downloaded packages
`-y`	Assume yes to all prompts
`--assume-no`	Assume no to all prompts
`-s, --simulate`	Simulate running this command and show it's output, without actually changing anything