How can I install GNOME 3.4 without performing a whole
sudo apt-get upgrade?
What are the packages I need to install?
Ubuntu 12.04 already contains GNOME3.4 except for a few packages that where updated after the feature lock. Per se, if you update your system you are probably already using it.
If you want the updated packages you need to add the necessary PPA from the GNOME3 team
After that you should do an
It makes no sense to install them individually, but, if that is what you want the current missing packages are: aisleriot, gcr, gnome-disk-utility, gnome-documents, gnome-keyring, gnome-session, libgnome-keyring, seahorse, totem, tracker and udisks2.
Installing them individually will pull out further dependencies for them and so on, in the end it will be the same as just updating your system.