Comment 17 for bug 255545

I haven't tried this specifically (as a work-around), but if you burn a recent Hardy daily build (dvd to get more packages?), it will have the apt-cdrom tool updated, and the installer should recognize it as having updates and do the upgrade of the packages. Then Intrepid should install without any problems.

The other "fix" is to decompress the Package files (extract/reburn the intrepid iso).

A third possible fix is to first upgrade the apt packages from the intrepid disk manually (dpkg -i /media/cdrom/...)

I don't think if you boot live it can upgrade a Hardy to Intrepid.