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Possible Duplicate:
Problem on upgrade from 11.10 to 12.4 with CD

Hello !

After installing and checking few times for packages that are not in Ubuntu 11.10. I decides to upgrade to version 12.04LTS. But I can`t find an "Upgrade" button. And of course the sentence 'New Ubuntu release 12.04LTS is available'. What is a wrong here? How can I upgrade?

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marked as duplicate by jrg♦ Jun 7 '12 at 12:43

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1 Answer

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You will not see an upgrade button unless you bring up Update Manager. Below are different ways that can help you in your process.

Use this method if the system being upgraded is not connected to the Internet. To upgrade using a CD or DVD See Upgrading Using the Alternate CD/DVD

Otherwise you can

From the desktop Press Alt+F2 and type in update-manager

Or

For servers:

sudo apt-get install update-manager-core
do-release-upgrade

First check for updates, then Install them, and finally click Upgrade and follow the on-screen instructions.

enter image description here

See https://help.ubuntu.com/community/PreciseUpgrades for details.

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I made some (small) edits to your excellent answer. first , with update-manager, -d updates to a development release. Now that 12.04 has been released, that would be 12.01. manpages.ubuntu.com/manpages/oneiric/man8/update-manager.8.html Second, your apt-get command does not upgrade to 12.04. upgrading by apt-get is not advised, use update-manager-core – bodhi.zazen Jun 7 '12 at 12:34

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