Simple instructions for upgrading to Cinnamon 2.0 on Linux Mint 13/14/15. Instructions also for Ubuntu, but Cinnamon 2.0 will break Unity on Ubuntu 13.10. Fair warning.
Open the apt preferences file:Add the following lines:
Most themes for Cinnamon 1.8 should work without any issues on 2.0.
You can find out more about Cinnamon 2.0 improvements here.