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Possible Duplicate:
Update manager doesn't offer an upgrade from 11.10 to 12.04

I currently have Ubuntu 11.10 and I would like to upgrade to Ubuntu 12.04. However, Update Manager is saying "Your System is up-to-date" and "There are no updates to install." When there are things to update, it will update just fine, but it is not displaying Upgrade Now option. I checked my Update Manager settings, and it says next to "Notify me of a new Ubuntu version" that it will check "For any new version." But this is not the case, it never gives me the option to upgrade no matter how many times I click "Check." I have also tried doing the "sudo apt-get install" command in the Terminal, but that has not allowed the computer to upgrade either. What am I supposed to do?

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marked as duplicate by Jjed, Jorge Castro, belacqua, hhlp, James May 10 '12 at 12:56

This question was marked as an exact duplicate of an existing question.

sudo do-release-upgrade from terminal should work. – Chris May 10 '12 at 3:33
the upgrade was a very very lengthy process for me. I would have reinstalled it. – HongboZhu May 10 '12 at 8:10

Try upgrading from the Ubuntu 12.04 CD instead. When you select the install option it should ask you if you want to upgrade the existing Ubuntu system.

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