[email protected]:~# cd ~/Downloads
[email protected]:~/Downloads# chmod +x xampp-linux-x64-5.6.23-0-installer.run
[email protected]:~/Downloads# ./xampp-linux-x64-5.6.23-0-installer.run
[email protected]:~/Downloads#
[email protected]:cd /opt/lampp/htdocs#
http://docs.kali.org/general-use/kali-linux-virtual-box-guest