Upgrade to Ubuntu 16.04 from Ubuntu 14.04 LTS or 15.10
Upgrading from Ubuntu 14.04 LTS or 15.10 14.04 LTS to LTS upgrades will be enabled with the 16.04.1 LTS point release, in approximately 3 months time. To upgrade on a desktop system: Open the “Software & Updates” Setting in System Settings. Select the 3rd Tab called “Updates”. Set the “Notify me of a new Ubuntu