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How To Upgrade Gnome 3.16 in Ubuntu 15.04 vivid Vervet
 
GNOME is a desktop environment which is composed entirely of free and open-source software and targets to be cross-platform, i.e. run on multiple operating systems, its main focus being those based on the Linux kernel.

GNOME 3.16 is the latest version of GNOME 3, and is the result of six months' work by the GNOME project. It includes major new features, as well as a large number of smaller improvements and enhancements. The release incorporates 33525 changes, made by approximately 1043 contributors. New features and improvements being introduced in GNOME 3.16 include:


Notifications Reimagined
GNOME 3's notifications system has been overhauled for 3.16. The previous Message Tray has been replaced by a new message list that provides straightforward access to previous notifications, and notification pop-ups (called "banners") have been repositioned in order to make them more noticeable and to prevent them from interfering with applications.

As with the previous notifications design, it is possible to quickly and directly respond to notifications through their pop-up banners. This allows you to do things like quickly snooze an alarm or reply to a chat message.

The calendar drop down, which is accessed from the time indicator in the top bar, has also been redesigned for 3.16. Not only does it now present the notifications history, but it also shows event reminders and world times. This gives a great overview of what is currently happening, as well as what is scheduled for the day. The addition of weather information and birthday reminders is planned for the future.



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To Upgrade Gnome 3.16 in Ubuntu 15.04 vivid Vervet

sudo apt-get update
sudo apt-get dist-upgrade -y
sudo add-apt-repository ppa: gnome3-team / gnome3-staging
sudo add-apt-repository ppa: gnome3-team / gnome3
sudo apt-get update
sudo apt-get install gnome-shell gnome-session

After the installation is complete, restart the computer packages.

Install additional apps not installed by default like GNOME Maps (an application to display the desktop), Polari (IRC client), lightweight browser etc:

sudo apt-get install polari gnome-music gnome-photos gnome-maps gnome-weather epiphany-browser

Revert back to Gnome 3.14

sudo apt-get install ppa-purge
sudo ppa-purge ppa: gnome3-team / gnome3-staging

And change the repository with a stable Gnome:

sudo ppa-purge ppa: gnome3-team / gnome3

Then restart your computer and you will sink version of Gnome, which by default comes with Ubuntu 15.04. For any issues, follow the thread below:

http://askubuntu.com/questions/630720/cannot-log-in-to-gnome-3-16-dekstop/631906#631906