Bug#774889: gdm3: fails to upgrade squeeze -> wheezy -> jessie - trying to overwrite /usr/share/gdm/BuiltInSessions/default.desktop

[Andreas Beckmann]

Package: gdm3
Version: 3.14.1-3
Severity: serious
User: debian-qa at lists.debian.org
Usertags: piuparts

Hi,

during a test with piuparts I noticed your package fails to upgrade from
'squeeze' to 'wheezy' to 'jessie'.
It installed fine in 'squeeze', and upgraded to 'wheezy'
successfully, but then the upgrade to 'jessie' failed,
because it tries to overwrite other packages files without declaring a
Breaks+Replaces relation.

See policy 7.6 at
https://www.debian.org/doc/debian-policy/ch-relationships.html#s-replaces

>From the attached log (scroll to the bottom...):

  Selecting previously unselected package gdm3.
  Unpacking gdm3 (from .../gdm3_3.14.1-3_amd64.deb) ...
  dpkg: error processing /var/cache/apt/archives/gdm3_3.14.1-3_amd64.deb (--unpack):
   trying to overwrite '/usr/share/gdm/BuiltInSessions/default.desktop', which is also in package gdm 2.20.11-4
  dpkg-deb: error: subprocess paste was killed by signal (Broken pipe)


cheers,

Andreas
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