update manager not detecting upgrade to 12.04

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http://askubuntu.com – I am using ubuntu 11.10 and update manager is not showing the option to upgrade it to 12.04. I have selected the 'Notify me of new Ubuntu version:' option to 'For any new version as suggested by some people, but still i am not getting the option to upgrade. Screenshot of Selecting Option: Screen shot of update manager not detecting upgrade: (HowTos)