Bug#373567: finish-install fails also with busybox v. 1.1.3-2

[Patrick Winnertz <patrick.winnertz@skolelinux.org>]

Package: finish-install
Followup-For: Bug #373567

I installed an cdd (debian-edu) and the installer failed in the
finish-install.postinst - script.  
Errormessage as above (shortly: unsupported option -k) 
The Busybox Version shipped with the cd is Busybox 1.1.3-2 and
finish-install is a backport from sid. (v. 2.3)
Here are two snaphots of the installer in a vmware session:

http://www.jwinnertz.de/skole/installer-loop.png and
http://www.jwinnertz.de/skole/installer-loop1.png

If you need logfiles  I will try to get them out of the vmware ;-)

Greetings
Patrick Winnertz

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.17-rc6
Locale: LANG=de_DE@euro, LC_CTYPE=de_DE@euro (charmap=ISO-8859-15)