How to upgrade to the latest GNOME version?

In the beginning the necessary warning that this is a version that is in development.

You can install the latest version of GNOME with two PPAs:

sudo add-apt-repository ppa:gnome3-team/gnome3-staging
sudo add-apt-repository ppa:gnome3-team/gnome3

Update the repositories:

sudo apt-get update

And upgrade your system (this should be used and not upgrade to avoid problems as stated when adding the PPAs to your system):

sudo apt-get dist-upgrade

Or if you want to reinstall GNOME

sudo apt-get install --reinstall ubuntu-gnome-desktop

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To revert the upgrade install ppa-purge

sudo apt-get install ppa-purge

and the following commands in this order:

sudo ppa-purge ppa:gnome3-team/gnome3-staging
sudo ppa-purge ppa:gnome3-team/gnome3