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Possible Duplicate:
How do I upgrade to the development release (aka. Ubuntu+1)?

I have Ubuntu 11.10 installed in my PC. Is it possible to upgrade to 12.04 from 11.10 itself. Without uninstalling 11.10 and then installing 12.04, is it possible to upgrade directly from 11.10?

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marked as duplicate by James Apr 4 '12 at 12:54

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

go with a virtual box if you just want to try 12.04 out. if not, just wait until it's released it will just be a couple of weeks... – Alvar Apr 4 '12 at 10:48
Possible duplicate -… – James Apr 4 '12 at 12:54

To upgrade from Ubuntu 11.10 or Ubuntu 10.04 LTS on a desktop system, press Alt+F2 and type in "update-manager -d" (without the quotes) into the command box. Update Manager should open up and tell you: New distribution release '12.04' is available. Click Upgrade and follow the on-screen instructions.

Please read as Beta releases can have errors

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Note that this will update you to the development release (which is not suitable for production use). Wait a couple of weeks and you will be asked if you want to upgrade to 12.04 by Update Manager. – Oli Apr 4 '12 at 10:57

A similar question was asked and answered on Ubuntu forums the other day regarding upgrading from 11.04 to 12.04 without going through 11.10 first. So, I will refer to the excellent answer provided by Kansusnoob here

Link to a previous answer on another site

Note this comment by kansusnoob:

There are now three ways to upgrade:

1: Using the update manager

2: Using the alternate CD

3: Using the live CD

Note how he proves, by providing this image, that the live CD can be used to upgrade an existing install to a distribution release and even do it with 11.04:

Image of live CD Installation type options

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