Checking / restoring / cleaning Kali Linux repositories

Original sources of applications (repositories) are the main key to the health of your Kali Linux.
The warning that changing/adding new repositories, as a rule, kills the system is on the official website.

Numerous experiences indicate that a huge number of problems are caused by errors in the sources of applications. If the standard Kali Linux instructions that work for most other users do not work for you, then 99% are due to modified kali repositories.

The most important thing in kali linux sources list  is this  line: