Error installing xulrunner-8.0

[Markus Levonyak]

Hello,

I've just tried to upgrade to/install the latest Iceweasel backport on  
Debian Squeeze (AMD64) and got the following error message (I've tried  
it a few times and also deleted the apt cache - but always with the  
same result):

$ sudo apt-get install -t squeeze-backports iceweasel
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following extra packages will be installed:
   xulrunner-8.0
Suggested packages:
   ttf-mathematica4.1 mozplugger
The following NEW packages will be installed:
   iceweasel xulrunner-8.0
0 upgraded, 2 newly installed, 0 to remove and 80 not upgraded.
Need to get 11.4 MB/13.1 MB of archives.
After this operation, 30.7 MB of additional disk space will be used.
Do you want to continue [Y/n]? y
Get:1 http://mozilla.debian.net/ squeeze-backports/iceweasel-release  
xulrunner-8.0 amd64 8.0-1~bpo60+1 [11.4 MB]
Fetched 11.4 MB in 4s (2,718 kB/s)
(Reading database ... 155319 files and directories currently installed.)
Unpacking xulrunner-8.0 (from .../xulrunner-8.0_8.0-1~bpo60+1_amd64.deb) ...
dpkg (subprocess): unable to execute new pre-installation script  
(/var/lib/dpkg/tmp.ci/preinst): Exec format error
dpkg: error processing  
/var/cache/apt/archives/xulrunner-8.0_8.0-1~bpo60+1_amd64.deb  
(--unpack):
  subprocess new pre-installation script returned error exit status 2
configured to not write apport reports
                                       Selecting previously deselected  
package iceweasel.
Unpacking iceweasel (from .../iceweasel_8.0-1~bpo60+1_amd64.deb) ...
Adding 'diversion of /usr/bin/firefox to /usr/bin/firefox.real by iceweasel'
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Processing triggers for man-db ...
Processing triggers for hicolor-icon-theme ...
Processing triggers for menu ...
Errors were encountered while processing:
  /var/cache/apt/archives/xulrunner-8.0_8.0-1~bpo60+1_amd64.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)

Best regards,
Markus