Bug#752404: libc6: Does not account for two packages from different archs being present

["Ralf G. R. Bergs" <Ralf+Debian@Bergs.biz>]

Package: libc6
Version: 2.19-3_i386
Severity: normal

Dear Maintainer,

I have both amd64 and i386 enabled on my system. When I upgraded the
system today I spotted the following error:

------- 8x ----------
Preparing to unpack .../archives/libc6_2.19-3_i386.deb ...
De-configuring libc6:amd64 (2.19-1) ...
dpkg-query: error: --listfiles needs a valid package name but 'libc6'
is not: ambiguous package name 'libc6' with more than one installed
instance

Use --help for help about querying packages.
Unpacking libc6:i386 (2.19-3) over (2.19-1) ...
Preparing to unpack .../libc6_2.19-3_amd64.deb ...
Unpacking libc6:amd64 (2.19-3) over (2.19-1) ...
------- 8x ----------

It seems that the deconfigure script does not account for multiple
versions of the package potentially being present on a system.

Thank you!

KR,

Ralf

-- System Information:
Debian Release: jessie/sid
  APT prefers testing-updates
  APT policy: (500, 'testing-updates'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.14-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash