I've just installed Raring, keeping an installation of Precise.
There's still a few stuff I have to fix. The most important would be to downgrade Nautilus. There are *a few* interesting new stuff (Well, pretty much just the fact that there are icons in the "New" menu. XD), but I can't stand the rest. It searche everytime I type, slowing me.
How can I downgrade to Nautilus 3.4 (Precise) ?
I've read many sites, I haven't found a working solution on Quantal/Raring.
I've also tried to do it myself, and made things worse:
Download the Nautilus 3.4 Package from Ubuntu website. Wiped Nautilus 3.6 from Synaptic. Then when I launched the Nautilus 3.4 DEB, I have a dependency error. So I gave it a shot anyway (That was a risk. I was ready to reinstall Raring, and have a backup of Precise), and uninstalled this dependency (Which was also uninstalled Evolution, EyeOfGnome, Unity, Gnome-Shell... :S). Then installed the older version of the dependency. Tried to install Nautilus 3.4 from the DEB again, but another dependency error.
Allright. How I am suppose to this, then? That's way above my competences.
I've fixed Unity by simply reinstalled everything that was deleted (I've noted them, at least).