Bug#707235: debian-installer: Debian Wheezy Stable (7.0.0-i386) installer fails on LVM2 over dm-crypt

[Zachary Palmer <zep_debbug@bahj.com>]

Package: debian-installer
Severity: normal

This appears to be a regression bug.  I have a Dell Inspiron 1720 (circa 2008)
which I previously used as a work laptop.  The drive was configured as follows:

    sda
        sda1
            ext3 filesystem (for /boot)
        sda2
            physical device for encryption (sda2_crypt)
                physical volume for LVM2
                    vg0-root (ext3)
                    vg0-swap (ext3)
                    vg0-home (ext3)

This configuration installed quite nicely through the Debian installer menus for
Squeeze.

Yesterday, I pulled this laptop out of storage and attempted to wipe the
installation, replacing it with a fresh Debian Wheezy configuration.  The only
difference in layout is that my attempt yesterday uses ext4 rather than ext3.
Using this configuration with the Wheezy stable installer I downloaded
yesterday, GRUB fails to install.  I receive the following messages in the
diagnostics console:

    /usr/sbin/grub-probe: error: no such disk.
    Auto-detection of a filesystem of /dev/mapper/vg0-root failed.

I then reconsidered the use case for the laptop and decided to try without the
encrypted drive.  Eliminating that layer (but keeping LVM2) resulted in a
successful installation.

Let me know if I can provide any additional info.  Thanks!  :)

-- System Information:
Debian Release: 7.0
  APT prefers stable
  APT policy: (700, 'stable'), (500, 'stable-updates')
Architecture: i386 (i686)

Kernel: Linux 3.2.0-4-686-pae (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash