The fix in the blog you refer to is incorrect; instead, upgrade to
ubiquity 1.2.6 in the edgy-proposed repository before starting the
installation. In particular, nobbling the validation meant that you
weren't informed about the fact that you need to reformat the root
filesystem.
** Changed in: ubiquity (Ubuntu)
Status: Unconfirmed => Rejected
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Installer-based reinstallation of GRUB crashed
https://launchpad.net/bugs/89575
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