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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:
There are two things that you can do:
The first is to ALT-F2 and start update manager with the command
update-manager -d
the -d should show the upgrade option (you might have to check for updates first)
The second thing you can do is to upgrade from the command line with the command:
sudo do-release-upgrade
