Bug#642454: dpkg-deb: file [file] contains ununderstood data member data.tar.xz, giving up

[MMW <blubb@suremail.info>]

Package: libc6-dbg
Version: 2.13-21_amd64
Severity: grave
Justification: renders package unusable

Dear Maintainer,

on trying to install valgrind on sid, the installation of the required package
libc6-dbg fails with the following error message both when using apt-get
to retrieve the package and when manually downloading from a mirror

Unpacking libc6-dbg (from libc6-dbg_2.13-21_amd64.deb) ...
dpkg-deb: file `libc6-dbg_2.13-21_amd64.deb' contains ununderstood data
member data.tar.xz     , giving up
dpkg: error processing libc6-dbg_2.13-21_amd64.deb (--install):
 subprocess dpkg-deb --fsys-tarfile returned error exit status 2
Errors were encountered while processing:
 libc6-dbg_2.13-21_amd64.deb


Regards,
MMW


-- System Information:
Debian Release: squeeze/sid
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.30-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libc6-dbg depends on:
ii  libc6  2.13-21

libc6-dbg recommends no packages.

libc6-dbg suggests no packages.