Linux Mint 17.1 MATE Metasploit

I have Linux Mint 17.1 MATE dual booted on my mid 2010 MacBook Pro 13. How can I get metasploit for Mint? I'm trying to learn how to hack, and based on the AMAZING tutorials on here, it sounds like a necessary and invaluable tool. I looked on metasploit.com and saw that I can only get the limited version for free. Is there a way that I can get the full version for free? I really don't want to switch to backtrack or kali until I've practically mastered linux and hacking. Thank You, in advanced, for all your help!