Bug#685128: grub-install (1.99) fails with a 126 error code

[yannubuntu at gmail.com]

Package: grub2
Version: 1.99-21
OS: Ubuntu 12.04
Originaly posted at https://bugs.launchpad.net/grub/+bug/1037922
The user (Rik = rufn) reported this problem:

- Just before the problem appeared: Rik is not certain what he was doing
but he may have disconnected a second hdd, he now only has one drive
connected and had 2 earlier. He also installed the latest updates.

- Then: the system failed to boot and gave message "unknown filesystem grub ???"

- Attempt of GRUB repair: Rik ran Boot-Repair (from a Boot-Repair-Disk),
and selected the recommended repair, which tried to reinstall GRUB via
chroot into the installed Ubuntu (log: http://paste.ubuntu.com/1149152 ).
As we can see in the log:
- grub-install failed (MBR still points to sda6 when it should point to sda1)
- grub-install returned a 126 error code
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