 Starting with the release of Mint 17, all future versions were planned to use a LTS version of Ubuntu as a base, until 2016.Under this strategy, Mint 17.1 was released on November 29, 2014, Mint 17.2 was released on June 30, 2015, and Mint 17.3 was released on December 4, 2015.The 17.x releases are intended to be an easy, optional upgrade.