[Bug 1051239] [NEW] default grub-install not on same disk as root partition

[Redmar]

Public bug reported:

When installing from mini.iso on usb, some hardware will recognise the
install usb as /dev/sda, and name the internal HD /dev/sdb. If you then
install the system to /dev/sdb, the default location for grub is still
/dev/sda (even though this is not indicated anywhere in the installer).
This results in an unusable system after reboot, since grub was
installed to the usb-drive. Furthermore, this behaviour is inconsistent
with that of the graphical installer (ubiquity), which installs grub on
the same disk the system is installed to.

I would therefore like to request a change in the default behaviour of debian-installer to install grub to the same disk as the root partition. This has two advantages:
1) Install is less likely to fail
2) Consistency across all installers for ubuntu.

Another solution would be to at least have the installer indicate where
it is going to install grub, so users have some way to know something
could be going wrong.

** Affects: debian-installer (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1051239

Title:
  default grub-install not on same disk as root partition

Status in “debian-installer” package in Ubuntu:
  New

Bug description:
  When installing from mini.iso on usb, some hardware will recognise the
  install usb as /dev/sda, and name the internal HD /dev/sdb. If you
  then install the system to /dev/sdb, the default location for grub is
  still /dev/sda (even though this is not indicated anywhere in the
  installer). This results in an unusable system after reboot, since
  grub was installed to the usb-drive. Furthermore, this behaviour is
  inconsistent with that of the graphical installer (ubiquity), which
  installs grub on the same disk the system is installed to.

  I would therefore like to request a change in the default behaviour of debian-installer to install grub to the same disk as the root partition. This has two advantages:
  1) Install is less likely to fail
  2) Consistency across all installers for ubuntu.

  Another solution would be to at least have the installer indicate
  where it is going to install grub, so users have some way to know
  something could be going wrong.

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