<source bash> deb http://ftp.de.debian.org/debian/ testing main deb-src http://ftp.de.debian.org/debian/ testing main

deb http://security.debian.org/debian-security testing/updates main contrib deb-src http://security.debian.org/debian-security testing/updates main contr$

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

</source>

<source bash> nano /etc/apt/preferences.d/debiankali Package: * Pin: release a=testing Pin-Priority: 1000

Package: * Pin: release n=kali-rolling Pin-Priority: 800

</source>

<source bash>

</source>

<source bash> wget -q -O - https://archive.kali.org/archive-key.asc | apt-key add apt-get update </source>

deb http://repo.vivaldi.com/stable/deb/ stable main
wget -O - http://repo.vivaldi.com/stable/linux_signing_key.pub | apt-key add