Release Announcement: This point release includes many updates, and updated installation media has been provided so that fewer updates will need to be downloaded after installation.

Dash scopes can now be enabled and disabled from Application lens, inside dash itself.

Nvidia Optimus support got better (But not perfect yet).

Nautilus: ‘Typeahead’ (recursive dropped) and ‘Backspace’ to go up are back.Global menu can be disabled for individual applications.Click to minimize on application launcher (disabled by default).HiDPI (High pixel density display – Retina) for High resolution screens and desktop scaling.Unity new lock screen (With fast lock) and new screensaver.Upstart has been upgraded to version 1.12.x.Many default applications regained well-integrated menu bars under Unity.Here we made available 14.04.x 32bit and 64bit images for VirtualBox (VDI) and VMware (VMDK).

Ubuntu 14.04 Trusty Tahr was a big release from Ubuntu team, it is faster and mature enough than any other Ubuntu version as I think.

Uninstall virtualbox ubuntu 14.04