How to Add Official Kali Linux 2019.2 Repositories in sources.list File?
Step 1: Go to the link below:-
https://docs.kali.org/ , and then scroll down to 'using kali linux' version, under that click on the link 'Kali sources.list Repositories'
Step 2: Now, copy the Regular repositories and Source repositories from there.
Step 3: Go to the Desktop, and then Right click on it. Click on 'Open in Terminal'.
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https://www.youtube.com/watch?v=j2wULzZpxM4