Ubuntu 16.04 LTS Xenial Xerus is now available for download. Xenial Xerus is Long-Term Support (LTS) release. It is supported for 5 years with critical security, bug and app updates from Canonical. xenial means friendly relations between hosts and guests and Xerus means the African ground squirrels.
This version of ubuntu ships with a modified version of Linux 4.4 kernel with Intel Skylake processor,3D in the virtual GPU driver,TPM 2.0 chips and Journaled RAID 5 support.
Zfs filesystem support natively in ubuntu.
Python 3.5 is default in this version of ubuntu.
New Snappy packaging format.
Now you can move Unity launcher to the bottom of the screen.
Unity version is 7.4.
Option to ‘Always Show Menus’ in System Settings.
New Format option added to device quicklist
Nwew desktop calendar app and anew software store.
Now online searches disabled in Dash.
You can upgrade to Ubuntu 16.04 from Ubuntu 15.10 and Ubuntu 14.04 LTS using the Update Manager app or download from below link for fresh install.