User Friendly Re-installation App?

[Hakan Koseoglu]

On 8 October 2011 19:32, Amichai Rotman <amichai at iglu.org.il> wrote:
> Hi,
> I recently tried to change my shell to Gnome3 following this guide:
> http://www.ubuntugeek.com/how-to-install-gnome3-on-ubuntu-11-04-nattyubuntu-10-10-maverick.html
> I don't like it and want to go back. I understand the only way is to
> re-install Natty from scratch (formatting the / partition) and restoring all
> installed apps after updating the fresh installation...
Use ppa-purge.

Funnily enough, it's already mentioned in the link you have posted.