The recent upgrade did not deal with obsolete conffiles properly.
Please use the dpkg-maintscript-helper support provided by dh_installdeb
to remove these obsolete conffiles on upgrade.

http://www.debian.org/doc/debian-policy/ch-files.html#s-config-files
http://manpages.debian.net/man/1/dh_installdeb

This bug report brought to you by adequate:

http://bonedaddy.net/pabs3/log/2013/02/23/inadequate-software/

$ pkg=libcap2-bin ; adequate $pkg ; dpkg-query -W -f='${Conffiles}\n' $pkg | grep obsolete
libcap2-bin: obsolete-conffile /etc/security/capability.conf
 /etc/security/capability.conf 42907d60c72848d86e61eacf0e9e03d7 obsolete

We believe that the bug you reported is fixed in the latest version of
libcap2, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to 768229@bugs.debian.org,
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Christian Kastner <debian@kvr.at> (supplier of updated libcap2 package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing ftpmaster@ftp-master.debian.org)
Format: 1.8
Date: Fri, 13 Mar 2015 21:28:23 +0100
Source: libcap2
Binary: libcap2-bin libcap2 libcap2-dbg libcap-dev libpam-cap
Architecture: source
Version: 1:2.24-7
Distribution: unstable
Urgency: medium
Maintainer: Christian Kastner <debian@kvr.at>
Changed-By: Christian Kastner <debian@kvr.at>
Description:
 libcap-dev - POSIX 1003.1e capabilities (development)
 libcap2    - POSIX 1003.1e capabilities (library)
 libcap2-bin - POSIX 1003.1e capabilities (utilities)
 libcap2-dbg - POSIX 1003.1e capabilities (debug)
 libpam-cap - POSIX 1003.1e capabilities (PAM module)
Closes: 768229 780411
Changes:
 libcap2 (1:2.24-7) unstable; urgency=medium
 .
   * debian/libcap2-bin.maintscript:
     - Remove obsolete conffile capability.conf. Closes: #768229
   * debian/control:
     - Add Breaks+Replaces for libcap-bin. libcap-bin was removed after lenny,
       but the transition to libcap2-bin was not fully handled. Closes: #780411
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 e4bb76c0a53574e3516fd1b3d3d3f1781d4d4099580e609c896cb71031063bea 17412 libcap2_2.24-7.debian.tar.xz
Files:
 070f51e37eaaef7ca13f382cab1d9225 2125 libs optional libcap2_2.24-7.dsc
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-----END PGP SIGNATURE-----

Hi,

The change in -7 which supposedly was to fix this was reverted in -8
because it potentially had unwanted and serious side effects.

I don't think that a proper fix will be trivial, see the references in
#781448. Or phrased differently, I don't see a fix that is simple enough
that I would be comfortable to attempt this late into the jessie release
process.

Regards,
Christian

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