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kali@kali:~$ echo "deb http://http.kali.org/kali kali-last-snapshot main contrib non-free" | sudo tee /etc/apt/sources.list
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kali@kali:~$ echo "deb https://http.kali.org/kali kali-last-snapshot main contrib non-free non-free-firmware" | sudo tee /etc/apt/sources.list