I'm working on this.
My first step was to replace Wubi's built-in copy of grldr (originally
from GRUB4DOS, as noted by bcbc) with the version available in the
ntldr-img grub-extras branch, which is built as an add-on to GRUB 2.
(There's a little work to do to allow that to be used for Wubi, but
that's the least of my worries right now.) This suffered from the same
problem, but at least this way I'm working with code where I have
upstream commit access and something resembling an ongoing maintenance
commitment. I'm thus going to handle this as though it were a grub2
bug.
Next, having got to the point of being able to repeatedly build,
install, and test modified versions of wubildr.mbr, I started trying to
insert debug code. This is very difficult due to the constraints in
place here. NTLDR only loads 8192 bytes from disk, and grldr must fit
within that (which is why we can't just use GRUB 2 directly here, as
even the most minimal GRUB 2 kernel is somewhat too big for this); it
only allocates 2048 bytes for the NTFS bootstrap code, and we're very
close to the limit here.
So far, I have got to the point of determining that it's calling the
NTFS_Corrupt_Error function and failing. There are ten calls to this in
ntfsbs.S, and I'm bisecting to find out which it is. After that I will
have to figure out how to determine why. The process is very time-
consuming.
** Package changed: Ubuntu Natty => grub2 (Ubuntu Natty)
** Changed in: grub2 (Ubuntu Natty)
Status: Confirmed => In Progress
** Changed in: grub2 (Ubuntu Natty)
Assignee: Canonical Foundations Team (canonical-foundations) => Colin
Watson (cjwatson)
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https://bugs.launchpad.net/bugs/693671
Title:
wubi install will not boot - phase 2 stops with: Try (hd0,0): NTFS5
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