Comment 5 for bug 62516

Thanks for your report. At present, you must reformat system partitions (e.g. /, /boot, /usr, or /var) during installation; the fact that the partitioner doesn't warn you about this is also bug 47046, and is fixed in 6.06.1. If you are upgrading an existing installation, then please see http://wiki.ubuntu.com/DapperUpgrades rather than using this installer.