Ubuntu 11.04 Problem
 

Hi,

I installed Ubuntu 11.04 on my machine and configuration of my machine is as follows

Processor: Inter Core 2 Duo
RAM: 2 GB

and after installing ubuntu I installed CCSM and when I changed setting in CCSM manager Ubuntu stops responding. and when I restart machine it's not opening any of the application and even it's not showing list of Application(just empty desktop), I can just open file browser. I don't understand what is problem? please tell me how can I solve problem?

You will get better help by posting your question, as well as all of the steps you did in detail, at the CCSM forums...

http://forum.compiz.org/

Following Steps I followed
1.Install CCSM using Ubuntu Software Center
2: After Installing CCSM I opened settings of CCSM and I click on Desktop Cube and as soon as I clicked ubuntu System hangs and when I restart it it's not opening any of the application and not starting natty Desktop. I am now clueless about how to solve this problem.

What graphics card do you have? You need to have 3D direct rendering enabled for your graphics card to run compiz. If you have a nvidia or ati card you will need to install the proper driver for your card. The easiest way to do this is from the hardware drivers manager in Ubuntu.

I don't have graphics card. i just have core 2 duo processor. but in ubuntu 10.04 the CCSM was working out of box on my machine then why it's not working on ubuntu 11.04? and even if it's nor working how can i restore my ubuntu 11.04? or will I need to reinstall it again?

You must have a graphics chipset somewhere, even if it's on-board. Does the "Additional Drivers" dialogue say anything?

What is the output of
(Run these from the Live CD if you can't boot)