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I'm using Ubuntu 9.10

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Can you provide more details? Are you currently running Ubuntu? Or Windows? Or something else? – th3dude May 5 '10 at 17:17
Then my answer is the easiest way to proceed ;) Considering you have GUI installed... – Marc-Andre R. May 5 '10 at 17:21
Also somewhat related:… – th3dude May 5 '10 at 17:26
Yeah this is what I was talking about. I'll add it to my post, thank. – Marc-Andre R. May 5 '10 at 17:29
The update-manager should offer the option at the top of the list of package updates next time it runs – Martin Beckett May 5 '10 at 17:47
up vote 3 down vote accepted

If you don't have it already, you gonna need a free partition on your harddrive to install it beside your current OS. If you need to create a partition, Windows Seven (if you have Windows 7) allow you to shrink a partition so you'll be able to create some place for Ubuntu.

If you already have it , just go in Updater Manager panel and you'll have an option to upgrade to 10.04 LTS on top of it.

More details here :

Update : (thanks to th3dude )

Could check this out too that outline exactly what I'm talking about :

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You are assuming they are already running Ubuntu. – th3dude May 5 '10 at 17:16

You can use Update Manager as specified in Julien's answer, or from a terminal you can use:

sudo do-release-upgrade
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Yes, do ALT + F2, type "update-manager -c", and the update manager will offer you to upgrade your Ubuntu version.

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You are assuming they are running Ubuntu already. – th3dude May 5 '10 at 17:16
sudo apt-get dist-upgrade from a terminal will work fine too :) – Sathya May 5 '10 at 17:26
@Sathya: No, you would need to edit the package sources first. But that's not recommended as it isn't officially supported and may or may not fail. – Florian Diesch May 5 '10 at 17:44
@Julien Nicoulaud: don't use -d as this will upgrade to the latest devel release is possible. Use -c instead. – Florian Diesch May 5 '10 at 17:46
Hum yes, I did not notice Ubuntu 10.04 was released already. edited. – nicoulaj May 5 '10 at 17:59

Manual upgrade from Karmic to Lucid from the command line:

sudo sed -i 's/karmic/lucid/g' /etc/apt/sources.list && sudo aptitude update && sudo aptitude dist-upgrade
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