[Bug 1070485] Re: Ubiquity switches sda and sdb in Grub configuration, causing boot failure

[Pjotr12345]

@ Adam Conrad: how can I check this?

Note: the laptop it happens on in my case, is a fairly new Lenovo b570e.

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https://bugs.launchpad.net/bugs/1070485

Title:
  Ubiquity switches sda and sdb in Grub configuration, causing boot
  failure

Status in “ubiquity” package in Ubuntu:
  Confirmed

Bug description:
  When I install *buntu 12.10 by means of a Live USB (USB memory stick),
  Ubiquity often (not always) wrongly identifies the memory stick as
  'sda' and the hard disk as 'sdb'.

  Ubiquity then installs *buntu 12.10 nevertheless on the hard disk with
  nearly all configuration right, namely the hard disk as 'sda'. With
  one fatal exception: Grub. Grub is configured to boot from 'sdb'.

  Upon first boot from the hard disk (with the USB stick removed), Grub then of course spawns this error:
  error: unknown filesystem
  grub rescue>

  When I found out what the cause was, it was easy to repair: simply boot up the PC by means of a *DVD* and point Grub to 'sda' by means of this terminal command:
  sudo mount /dev/sdaX /mnt && sudo grub-install /dev/sda --root-directory=/mnt
  (where the X in sdaX needs to be replaced by the partition number of the root partition)

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