How to Fix Kali Linux Repository
This repository is actually Debian’s Testing distribution with all the kali-specific packages (available in the kali-dev-only repository) force-injected. Kali packages take precedence over the Debian packages. Sometimes when Testing changes, some Kali packages must be updated and this will not happen immediately. During this time, kali-dev is likely to be broken. This repository is where Kali developers push updated packages and is the basis used to create kali-rolling.