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Bug#609558: encrypted system on USB drive is unbootable

Package: installation-reports

Boot method: CD
Image version: debian-507-i386-CD-1.iso (via bittorrent)
Date: 2011-01-10 09:00

Machine: Dell Latitude E6400
Processor: Intel Core2 Duo T9900 @3.06GHz
Memory: 4GB
#1 255.0MB   ext2    /boot
#2 79.8GB    crypto  (sdb2_crypt)

Output of lspci -knn (or lspci -nn):

Base System Installation Checklist:
[O] = OK, [E] = Error (please elaborate below), [ ] = didn't try it

Initial boot:           [O]
Detect network card:    [O]
Configure network:      [O]
Detect CD:              [O]
Load installer modules: [O]
Detect hard drives:     [O]
Partition hard drives:  [O]
Install base system:    [O]
Clock/timezone setup:   [O]
User/password setup:    [O]
Install tasks:          [O]
Install boot loader:    [O] maybe E
Overall install:        [E]


Attempted to install an encrypted LVM system on a USB-attached hard
drive.  Tried to do as "vanilla" an install as possible, accepting the
defaults where I could.  One non-default is that I wrote GRUB to
(hd1,0), the USB drive, instead of the default since I didn't want to
disturb the primary drive which has an encrypted Windows installation.

Everything appeared to go OK but the system can't boot.  It reaches
the GRUB menu but when GRUB tries to boot the kernel I don't get
prompted for a password and I get:

Filesystem type unknown, partition type 0xde
Kernel /vmlinuz-2.6.26-686 root=/dev/mapper/mm177490--pc-root ro
Error 17. Cannot mount the selected partition.

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