Comment 7 for bug 72897

Colin Watson (cjwatson) wrote :

In Ubuntu 8.04, you can choose not to format the target partition; if you do that, the installer will prompt you for confirmation, and if you tell it to carry on it will remove various directories liable to clash with the new install. (For the moment it will remove /var; we might want to be a little more fine-grained in future. Still, it fulfils the basic request of this bug report.)

  https://blueprints.launchpad.net/ubuntu/+spec/ubiquity-preserve-home