kali repo on debian

 Add kali repo to sources

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sudo nano /etc/apt/sources.list

deb http://http.kali.org/kali kali-rolling main non-free contrib

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to see current repo priority

apt-cache policy

to adjust apt priority

sudo nano  /etc/apt/preferences.d/kali-pin

Package: *

Pin:release o=kali

Pin-Priority: 10