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Update: there is now an development ISO available for download or you could simply press ALT + F2 and type:
update-manager -d

Then follow the on-screen instructions.

The rest of the how-to below is obsolete and should only be used in early Ubuntu development stages (such as before Alpha 1, etc.).


Ubuntu Lucid Lynx is already available, but you can't upgrade to it (and I strongly advise you not to upgrade to Lucid Lynx unless you just want to test stuff) with the usual update-manager -d command.

But I found a way to upgrade to Ubuntu Lucid Lynx (10.04) from Karmic Koala (9.10), on Shakaran's blog (so all the credits go to him).

Here's what you need to do if you really want to already upgrade to Ubuntu Lucid Lynx 10.04 (at your own risk):

1. Open a terminal and paste this:
sudo sed -i 's/karmic/lucid/g' /etc/apt/sources.list && sudo aptitude update && sudo aptitude dist-upgrade

The above command changes your Karmic repositories to Lucid and upgrades the packages.

2. Once you complete step 1 (above), you can upgrade to Ubuntu Lucid Lynx the traditional way:
sudo aptitude install update-manager-core
sudo do-release-upgrade -d

Another way to do this is with Pearl, so that you can see if there will be errors with the packages:
# Firstly, make sure your computer is up-to-date
sudo aptitude update
sudo aptitude safe-upgrade

# Change the Karmic repositories for Lucid, using Perl
perl -p -i.karmic -e 's/karmic/lucid/' /etc/apt/sources.list

# Start upgrading the packages
sudo aptitude update
sudo aptitude install dpkg aptitude apt
sudo aptitude safe-upgrade
sudo aptitude full-upgrade

Disclaimer: No, I did not upgrade to Ubuntu Lucid Lynx yet, I'll wait for at least Alpha 1 or 2 to Upgrade (if not for the Beta).