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i issued the following commands:

sudo add-apt-repository ppa:gnome3-team/gnome3

sudo apt-get install gnome-shell

and then i found the following change in the system :

screenshot of the installed software list

but i dont find my desktop looking like this.

WHAT has gone wrong ? please help !

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Looks like your theme has a problem. Found something similar on here.

The answer from the source reads:

Try this, it worked for me:

sudo apt-get purge gnome-accessibility-themes
sudo apt-get install gnome-themes-standard

Then open the Gnome Tweak tool listed above and select Adwaita

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Ubuntu 11.10 uses Gnome 3 by default, and you don't have to add any PPA to get that desktop. It's in the official repositories. It's called Gnome Shell.

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But the screenshot suggests that the user is on Ubuntu 11.04 Natty Narwhal and not Ubuntu 11.10 Oneiric Ocelot – Nitin Venkatesh Jan 15 '12 at 9:39
yes, but I would always recommend upgrading Ubuntu instead of installing Gnome from a PPA. – Jo-Erlend Schinstad Jan 15 '12 at 11:00

It's perhaps unfortunate that you have installed Gnome-Shell on Natty (11.04) with that particular PPA.

In the PPA description:

=== Ubuntu 11.04 (Natty) === This PPA contains packages from GNOME 3.0 and their dependencies. It is considered EXPERIMENTAL and MAY BREAK YOUR SYSTEM. There is no downgrade process.

=== 2011/12/30 === There is no further Natty/11.04 support from now on!

The Gnome-3 packages in that PPA have now moved on and are increasingly incompatible with the remaining Natty packages. Even if you resolve this particular theming issue - you will increasingly encounter newer problems as time goes by and further updates are made.

I hate to say it - and the maintainers make it clear - you will need to reinstall your system :(

  1. Backup you /home folder to an external hard-drive,
  2. install 11.10
  3. use this Q&A to install gnome-shell
  4. copy back your files to your new home folder.
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