Hi Lavanya,
Can you describe the steps how you installed ubuntu 10.04 so that we can
identify the issues and tell you way to fix it.
http://www.techhamlet.com/2010/05/how-to-install-ubuntu-10-04/
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Cheers,
Ranjith Kumar.K,
Software Engineer,
Sedin Technologies,
http://ranjithtenz.wordpress.com/
http://victusads.com/