We believe that your issue has been closed by the upload of
Version 1.3.5 of grml2hd from Michael Prokop <mika@grml.org>.
The explanation is attached below

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Format: 1.8
Date: Thu, 01 Apr 2010 16:31:44 +0200
Source: grml2hd
Binary: grml2hd
Architecture: source all
Version: 1.3.5
Distribution: unstable
Urgency: low
Maintainer: Michael Prokop <mika@grml.org>
Changed-By: Michael Prokop <mika@grml.org>
Description: 
 grml2hd    - make a harddisk installation of grml
Changes: 
 grml2hd (1.3.5) unstable; urgency=low
 .
   * Use posix compliant syntax for PREEXECUTE/POSTEXECUTE in config file.
     [Closes: issue836]
Checksums-Sha1: 
 1d98b3519a7fea8be1690a8e67c1c17c130aa535 913 grml2hd_1.3.5.dsc
 e43c5b14ed5a047b6ec31b09804eb4d34a9ff1a3 295477 grml2hd_1.3.5.tar.gz
 4693f1e12b6cd929df4a949e486844ec970f2589 295932 grml2hd_1.3.5_all.deb
Checksums-Sha256: 
 77922755708616bb24a901cc7d20ec71ea23d206090b704ecf1f2c3514f94801 913 grml2hd_1.3.5.dsc
 5cab9ffc38a5da517fb3dc459bb5a63ad8cb1aa351cc4f2cc1d20c598bce1baf 295477 grml2hd_1.3.5.tar.gz
 52b7ce0fab58c5b67a56f3a4cbe48c3833b3a01d29e7b0614c86e258d718f388 295932 grml2hd_1.3.5_all.deb
Files: 
 716a30be0f3b4811d37e303c3a46b6d9 913 grml optional grml2hd_1.3.5.dsc
 712ea25ead8bad125b603dad553163b1 295477 grml optional grml2hd_1.3.5.tar.gz
 30891092e6317ebf48f7ef9380ee449c 295932 grml optional grml2hd_1.3.5_all.deb

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root@grml ~ # cat /etc/grml_version
grml-medium 2010.04-rc1 Release Codename Grmlmonster [2010.03.24]
root@grml ~ # bash
root@grml:~# . /etc/grml2hd/config 
bash: /etc/grml2hd/config: line 58: syntax error near unexpected token `;'
bash: /etc/grml2hd/config: line 58: `function PREEXECUTE() { ; }'