Bug#647267: debian-installer: grub-install tries to install on the wrong drive

[Gabriel Kerneis <kerneis@pps.jussieu.fr>]

Package: debian-installer
Severity: important
Tags: d-i

Dear Maintainer,

I used the debian-installer yesterday: daily build for testing, netinst
image, hybrid ISO image written directly to a usb key, expert mode.

The installer correctly detected that Debian was the only OS installed
(on a fresh SSD) but then failed to write the boot sector.  The reason is
that it tried to write to /dev/sda, which was the USB key containing the
netinstall image.  It should instead have tried to write to /dev/sdb, which
was the SSD.

Removing the usb key and retrying solved the issue.  This is annoying
nonetheless.  IMHO, the installer should:
- try to install on the device which holds the /boot partition,
- or at least, allow to select which drive to install grub on.

Best regards,
-- 
Gabriel Kerneis