I have a fix for the problem. This affects those with Windows Vista
partitions being mis-identified as "Windows Recovery Environment". The
problem is that os-prober is using /usr/lib/os-
probes/mounted/20microsoft to read specific attributes of the identified
Windows drive. One of these attributes is checking for "W.i.n.d.o.w.s.
.R.e.c.o.v.e.r.y. .E.n.v.i.r.o.n.m.e.n.t" within C:\boot\BCD. In Vista
and Windows 7, the BCD file will have that entry. Windows 7 users avoid
this problem because os-prober checks for "W.i.n.d.o.w.s. .7" first,
then checks for Windows Recovery Environment. It doesn't even look for a
Vista entry, it just assumes the drive is a Vista drive if all other
checks fail. The solution, therefore, is to specifically check for
"W.i.n.d.o.w.s. .V.i.s.t.a" *before* checking for Windows Recovery
Environment, and after checking for Windows 7. Ideally, the presence of
"Windows Recovery Environment" should be the last thing checked.

I don't know if this is the ultimate solution, and I don't have an
actual Windows Recovery partition to check this against, but the
attached file works for me. Simply replace /usr/lib/os-
probes/mounted/20microsoft with the attached file and re-run update-
grub.?field.comment=I have a fix for the problem. This affects those
with Windows Vista partitions being mis-identified as "Windows Recovery
Environment". The problem is that os-prober is using /usr/lib/os-
probes/mounted/20microsoft to read specific attributes of the identified
Windows drive. One of these attributes is checking for "W.i.n.d.o.w.s.
.R.e.c.o.v.e.r.y. .E.n.v.i.r.o.n.m.e.n.t" within C:\boot\BCD. In Vista
and Windows 7, the BCD file will have that entry. Windows 7 users avoid
this problem because os-prober checks for "W.i.n.d.o.w.s. .7" first,
then checks for Windows Recovery Environment. It doesn't even look for a
Vista entry, it just assumes the drive is a Vista drive if all other
checks fail. The solution, therefore, is to specifically check for
"W.i.n.d.o.w.s. .V.i.s.t.a" *before* checking for Windows Recovery
Environment, and after checking for Windows 7. Ideally, the presence of
"Windows Recovery Environment" should be the last thing checked.

I don't know if this is the ultimate solution, and I don't have an
actual Windows Recovery partition to check this against, but the
attached file works for me. Simply replace /usr/lib/os-
probes/mounted/20microsoft with the attached file and re-run update-
grub.

** Attachment added: "Replacement 20microsoft file for os-prober"
   http://launchpadlibrarian.net/50937366/20microsoft

-- 
Grub2 affected when os-prober incorrectly identifies Windows and Recovery 
partitions
https://bugs.launchpad.net/bugs/476625
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