Installing Gnome 3.8 on Ubuntu 12.04

Gnome 3.8 is released and I wanted to have it on my system running Ubuntu 12.04. I came across this: Gnome 3.8 on Ubuntu 12.04.2 lts

In the answers, it is mentioned that Gnome 3.8 is not available in 12.04 in a straight forward way.

Can someone please explain why?

As far as my understanding,the version 3.8 will be available through software centre only when Canonical provides it through their updates.

1. I have installed Gnome 3 through the PPA provided by the Gnome 3 team. So shouldn’t it be available as soon as a newer version is released in the PPA? Or, does it still depend on the OS version also?

2. The solution mentioned here adds three PPAs to the software source.

   http://www.ubuntukiller.com/2013/03/how-to-installupgrade-gnome-38-in.html

The first PPA(Gnome 3 team) is the one I already have. What are the other two PPAs supposed to do?

If I were you, I would just run the first PPA and see how Gnome 3.8 works. If there are features missing that you want to have, then add the 2nd PPA. The testing PPA is like a 'beta' version and the staging PPA is 'alpha' - guaranteed unstable, and yes you risk a possible system 'melt-down' that can only be recovered by having extreme knowledge of the linux / unix command line (or even a possible reinstall). Also please see these 2-articles on restoring your system: ubuntu sytem restore-1and system restore article-2

As far as your query, I basically copied and pasted from the link you provided and bolded the answers. Hope this helps! Personally, I am very happy to see Gnome 3.8 and am looking forward to the release of the pure Gnome (stable version) that is now a recognized distro in the Ubuntu family! please see this article: Ubuntu GNOME Remix Joins the Ubuntu Family

Then you need to add the Ricotz testing repository that contains cutting edge git versions for the shell, gtk, glib, clutter and many Gnome applications and utilities.

sudo add-apt-repository ppa:ricotz/testing
sudo apt-get update
sudo apt-get upgrade

If you want to get some more latest Gnome components and risk the stability of the system even further, then you can use the Ricotz staging repository that can be correctly used only if you added the previous two.

sudo add-apt-repository ppa:ricotz/staging
sudo apt-get update
sudo apt-get upgrade

After upgrading, you will have the latest available Gnome Shell version with many applications and utilities of the corresponding version. Note that some will still stay in 3.6.x version at least for now.