First of all, this is not Ubiquity bug at all, it happened to me several times when installing by d-i.
Also I disagree it has anything to do with the quality of cd-media, it happened to me several times in a row, until I repartitioned the disk, after that it was flawless every time afterwards. Oh yes, exactly the same was happening with LILO. ** Changed in: ubiquity (Ubuntu) Status: Rejected => Confirmed -- Installer Crashes REPEATEDLY "Unable to install GRUB in (hd0)" https://launchpad.net/bugs/60911 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs