I broke unity with gnome3 ppa, now what?

[FireSam]

Hi fellow ubuntu'ers,

I wanted to try using gnome3 after I upgraded to 11.04. unfortunately I did
not do enough research first. (
http://www.omgubuntu.co.uk/2011/04/gnome-3-released-to-be-available-for-ubuntu-11-04-via-ppa/)
Also I removed gnome3 trying to get unity back. Now I have nothing. how do I
undo that change now? that install does not have a network connection but i
can use an alternate install on an external drive (using it now). I also
have the alternate install cd of 11.04 natty narwhatever.

Thanks so much.
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