Salvo Isaja wrote:
I would tend to accuse the Debian Installer partition editor.
As a proof, I repeated the installation process, but instead of using the Debian Installer partition editor, I ran a shell and used fdisk. Next I resumed Debian Installer and used the partition editor only for partition types and mount points, completed the installation, installed GRUB on (hda0) MBR using grup-install via Debian Installer.
Everything works fine in this way. Salvo