A couple of steps to get Kali Rolling with Xfce running (on x86_64 devices)

1. sudo crouton -r kali-rolling -t audio,core

2. sudo enter-chroot -n kali-rolling

   a. sudo apt install curl
   
   b. sudo curl -O "http://http.us.debian.org/debian/pool/main/x/xbindkeys/xbindkeys_1.8.6-1_amd64.deb"
   
   c. sudo apt install ./xbindkeys*
   
   d. exit
   

3. sudo crouton -r kali-rolling -t xfce -u