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I installed gnome shell but when I start it it's the design of gnome classic... what can I do? I already reinstalled it. I have Ubuntu 11.10.

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It is defaulting to fall-back session. What graphics card do you have? – Bruno Pereira Jun 12 '12 at 16:36
ASUS HD 6670 I installed the drivers – Martin Jun 12 '12 at 16:45

This might be trivial

To make sure, install again gnome-shell from a terminal:

sudo apt-get install gnome-shell

Log out your session or restart your computer. Now, select the Gnome-shell session at the login screen. Otherwise it will start your default session, which in this case might be classic Gnome. Check this image for reference.

enter image description here

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I selected GNOME and not GNOME Classic. GNOME-shell doesn't exist. – Martin Jun 12 '12 at 16:47
then you don't have it installed I am afraid. Try this in a terminal: sudo apt-get install gnome-shell, then log out or restart and check if it is there – leousa Jun 12 '12 at 16:53
Output in terminal: gnome-shell is already the newest version. The same when I log out or restart. – Martin Jun 12 '12 at 16:57
Ok, try running this in a terminal: gnome-shell --replace (and post output here please). – leousa Jun 12 '12 at 17:05
(gnome-shell:3566): Gdk-WARNING **: The program 'gnome-shell' received an X Window System error. This probably reflects a bug in the program. The error was 'BadRequest (invalid request code or no such operation)'. (Details: serial 147 error_code 1 request_code 136 minor_code 19) (Note to programmers: normally, X errors are reported asynchronously; that is, you will receive the error a while after causing it. – Martin Jun 12 '12 at 17:09

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