Ubuntu 14.04 LTS was released on (2014.4.17). I updated my system to the latest version today and tried the latest UI system.
I chose the GUI of Ubuntu Gnome 14.04. In my previous system, 12.04 LTS also selected the GUI of Gnome Shell.
Ubuntu 14.04 download, installation, and configuration summary page
Install Ubuntu 14.04 on a hard drive in Windows 7. Permanent update address:
1. 163 update source
Deb http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse
Deb http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse
Deb http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse
Deb http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse
Deb http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
The deb-src http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse
Deb-src http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse
Deb-src http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse
The deb-src http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse
The deb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
163 image download http://mirrors.163.com/ubuntu-releases/14.04/
2. Ubuntu Gnome System
New Gnome Shell Management Interface
Browser (Chrome and Firefox)
File System. The interface is simple and elegant.
For more details, please continue to read the highlights on the next page: