Download crouton here.
2. Open a shell (CTL/ALT/T and type shell) and run the executable specifying Sana as the release.
sudo sh -e ~/Downloads/crouton -r sana -t xfce
3. Enter some info at the prompts.
4. Type the following in a shell to enter Sana.
sudo enter-chroot startxfce4
Update: I've noticed some comments crouton's version of Kali not having tools installed. This is by design, because most chromebooks only have 16GB hard drives. To install any tools, just use apt-get install.
Example (to install metasploit):
sudo apt-get install metasploit-framework
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