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When I press upgrade button on upgrade center it starts downloading and suddenly stops and shows message stating authentication failed and advises to check network connection even if it is connected. please help me out of this problem.

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could you gives the complete error report ? use paste bin and give us the link . – Raja Jun 23 '12 at 13:54
Which version of Ubuntu are you currently using? To upgrade to 12.04, you should first upgrade to 11.10. – To Do Jun 23 '12 at 14:28

Install update-manager-core if it is not already installed by using terminal:

sudo apt-get install update-manager-core

Launch the upgrade tool:

sudo do-release-upgrade

Follow the on-screen instructions.

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the message is " Authentication failed Authenticating the upgrade failed. There may be a problem with the network or with the server. " n i m using Ubuntu 10. – Bukhari Jun 23 '12 at 14:58

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