The problem with the installer at the moment is that it blindly tries to
install GRUB to the first disk in GRUB's device map, regardless of if it
can or not (apart from the special removable device code). This causes
problems when /dev/sda is a secondary disk that isn't configured at the
time of installation, and so because it contains no MBR GRUB fails to
install on it. I can see why installing to a drive that is different to
the one /boot exists on is beneficial with multiple OSes, but to be
honest when one selects 'erase disk and install Ubuntu' they likely do
not have or care about any other operating systems on other drives.

Even if another operating system exists on another drive, with this
patch GRUB will be installed to the 'secondary' drive, and so to start
using it one must simply change the boot order in the BIOS/UEFI. In
addition, perhaps the user does not want to overwrite the existing
bootloader, say, if GRUB is being managed by a different distribution on
the same system. But I just think that if one has another OS installed
on a system, they'd probably use the manual partitioning selection which
allows them to set the bootloader location manually, rather than the
'automate everything, erase disk and install' option.

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https://bugs.launchpad.net/bugs/704763

Title:
  boot loader not installed to target disk

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