We believe that your issue has been closed by the upload of
Version 0.28 of grml-debootstrap from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Format: 1.8
Date: Tue, 16 Jun 2009 16:11:30 +0200
Source: grml-debootstrap
Binary: grml-debootstrap
Architecture: source all
Version: 0.28
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml-debootstrap - wrapper around debootstrap for installing plain Debian via grml
Changes: 
 grml-debootstrap (0.28) unstable; urgency=low
 .
   * Work around the chpasswd problem. [Closes: issue692]
     Thanks to Ulrich Dangel <uli@spamt.net> for the patch!
Checksums-Sha1: 
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 2c7d8dab3a482cdc1b1641995989abadf5e5a50a 134276 grml-debootstrap_0.28.tar.gz
 121753522fc2d88db20a9f093faea2330365c744 110392 grml-debootstrap_0.28_all.deb
Checksums-Sha256: 
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Files: 
 012ab4b292a985ecad283065eb973aac 974 grml optional grml-debootstrap_0.28.dsc
 d4c0b6978355968827736039b70341de 134276 grml optional grml-debootstrap_0.28.tar.gz
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check chpasswd options if -m is a valid option

grml-debootstrap suffers from the annoying chpasswd change (the -m option got 
lost). A workaround within grml-debootstrap has to be applied.