It would appear that Mesa 12.0.6 3D Graphics Library, which was announced last week by Collabora’s Emil Velikov, has already hit the xenial-proposed and yakkety-proposed channels of the Ubuntu 16.04.1 LTS (Xenial Xerus) and Ubuntu 16.10 (Yakkety Yak) operating systems. So if you have the proposed repository (pre-release updates) enabled on your Ubuntu PC, you could update to Mesa 12.0.6 right now by enabling proposed updates in Software & Updates. However, Mesa 12.0.6 being the last in the series, it’s recommended that you move to the Mesa 13 branch from a stable third-party PPA, such as Padoka Stable Mesa.