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I have installed Gnome3 from the Gnome3 PPA and after restart NO window interface is appearing. I have installed LXDE, Gnome Classic and Unity 2D. When I've installed Gnome3 I was in the Unity 2D session and I think that this has been broken and now doesn't let me to login. After boot I enter in safe mode and from the console I want to change the log in environment to LXDE and after that to give Logout and choose Gnome3. How can I enter in LXDE (or directly in Gnome3) from console/terminal?

Btw gdm start gives me an error!

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in the description of the ppa it says:

"This PPA is EXPERIMENTAL and MAY BREAK YOUR SYSTEM. There is no downgrade process"

Gnome 3 is currently not supported by ubuntu, I don't know about the downgrade part but you can try removing the ppa with ppa-purge :

sudo apt-get intall ppa-purge sudo ppa-purge ppa:gnome3-team/gnome3

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and reinstall gnome-desktop, or ubuntu-desktop or other enviroments. –  Uri Herrera Jul 5 '11 at 4:01
    
Didin't remember adding the gnome 3 ppa removes unity :P –  xangua Jul 5 '11 at 23:23
    
it doesn't remove unity, but you know ... unity uses gtk2 and gnome 3 uses gtk3, errors might happen. –  Uri Herrera Jul 6 '11 at 1:03
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