#os Linux evankali 4.7.0-kali1-amd64 #1 SMP Debian 4.7.8-1kali1 (2016-10-24) x86_64 GNU/Linux

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echo 'deb http://download.virtualbox.org/virtualbox/debian stretch  contrib
' >> /etc/apt/sources.list
 # combine downloading and registering:
 wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
 #or
wget -c https://www.virtualbox.org/download/oracle_vbox_2016.asc
sudo apt-key add oracle_vbox_2016.asc
 apt-get update
apt-get install virtualbox-5.1

https://www.virtualbox.org/wiki/Linux_Downloads