Hello,
I just ran into this as well.

On Sat, Oct 25, 2014 at 06:56:05PM +0200, Bill Allombert wrote:
> On Sat, Oct 25, 2014 at 05:57:39PM +0200, Michael Banck wrote:
> > severity 766353 serious
> > thanks
> > 
> > On Wed, Oct 22, 2014 at 04:30:54PM +0200, Bill Allombert wrote:
> > > On Wed, Oct 22, 2014 at 03:20:41PM +0200, Rafael Belmonte wrote:
> > > > Package: libjpeg-progs
> > > > Version: 1:9a-2
> > > > Severity: important
> > > > 
> > > > --- Please enter the report below this line. ---
> > > > The package is not installable or upgradable if libjpeg-turbo-progs
> > > > is already installed.
> > > > This is the apt-get output:
> > > > dpkg: error processing archive
> > > > /var/cache/apt/archives/libjpeg-progs_1%3a9a-2_i386.deb (--unpack):
> > > >  trying to overwrite '/usr/share/man/man1/exifautotran.1.gz', which
> > > > is also in package libjpeg-turbo-progs 1:1.3.1-3
> > 
> > I ran into this as well just now when upgrading jessie.
> >  
> > > Indeed, you need to remove the broken libjpeg-turbo-progs 1:1.3.1-3
> > > before the upgrade. Later version of libjpeg-turbo-progs are fixed.
> > 
> > Erm, in that case, there should be additional Conflicts/Replaces
> > whatever relationships, methinks?
> 
> libjpeg-turbo-progs 1:1.3.1-3 is RC buggy and has never been part of a stable
> release, so I do not think this is necessary.

Why? 

a) On my machine, which run stable up to about ~1.5 month ago I never
   explicitly installed libjpeg-turbo-progs, so stable users who upgrade
   are most likly affected.
   (I only run dist-ugprade)

b) It is (more than) a courtesy for users / developers who run testing

c) RC-buggy packages are removed from the testing suite in the
   archives, but not from users machines
   (and, btw. libjpeg-turbo is no longer rc-buggy)

d) Looking at debian-policy, I read:
        It is usually an error for a package to contain files which
        are on the system in another package.
   I do not see an exception for rc-buggy relationships or such.
   Further as I understand it, it is the normal procedure for taking
   over files, to use breaks/replaces.

e) Is there any problem of uploading libjpeg-progs just with the
   appropriate breaks/relationship? I think the RMs would have no
   problem accelerating this into testing.

> The cause of the breackage you see is that the fixed libjpeg-turbo-progs
> 1:1.3.1-d for d>3 reached much later than I expected and in particular after
> libjpeg-progs 9-2. 

Sorry, I don't understand this sentence. 

Greetings

            Helge
-- 
      Dr. Helge Kreutzmann                     deb...@helgefjell.de
           Dipl.-Phys.                   http://www.helgefjell.de/debian.php
        64bit GNU powered                     gpg signed mail preferred
           Help keep free software "libre": http://www.ffii.de/

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