[Bug 918213] Re: apt-get source picks Ubuntu version instead of Debian when requesting Debian version and there is only "deb-src", but not "deb"

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** Changed in: apt (Debian)
       Status: Unknown => Confirmed

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Title:
  apt-get source picks Ubuntu version instead of Debian when requesting
  Debian version and there is only "deb-src", but not "deb"

Status in “apt” package in Ubuntu:
  New
Status in “apt” package in Debian:
  Confirmed

Bug description:
  When requesting the version from Debian (3.2.1-2), the Ubuntu version
  gets downloaded instead (3.2.1-2ubuntu1).

  % apt-cache madison backuppc | grep Source
    backuppc | 3.2.1-2ubuntu1 | http://archive.ubuntu.com/ubuntu/ precise/main Sources
    backuppc | 3.2.1-2ubuntu1 | http://archive.ubuntu.com/ubuntu/ precise/main Sources
    backuppc | 3.2.1-2ubuntu1 | http://archive.ubuntu.com/ubuntu/ precise/main Sources
    backuppc |    3.1.0-9 | http://ftp.de.debian.org/debian/ stable/main Sources
    backuppc |    3.2.1-2 | http://ftp.de.debian.org/debian/ unstable/main Sources
    backuppc |    3.2.1-2 | http://ftp.de.debian.org/debian/ testing/main Sources

  % apt-get source backuppc=3.2.1-2
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Need to get 543 kB of source archives.
  Get:1 http://archive.ubuntu.com/ubuntu/ precise/main backuppc 3.2.1-2ubuntu1 (dsc) [1,147 B]
  Get:2 http://archive.ubuntu.com/ubuntu/ precise/main backuppc 3.2.1-2ubuntu1 (tar) [512 kB]
  Get:3 http://archive.ubuntu.com/ubuntu/ precise/main backuppc 3.2.1-2ubuntu1 (diff) [30.1 kB]
  Fetched 543 kB in 1s (281 kB/s)  
  [...]

  I have then tried to use the release name instead, but it fails with
  both "/unstable" and "-t unstable" notation:

  % apt-get source backuppc/unstable
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  E: Ignore unavailable target release 'unstable' of package 'backuppc'
  E: Unable to find a source package for 

  % apt-get source -t testing backuppc
  Reading package lists... Done
  E: The value 'testing' is invalid for APT::Default-Release as such a release is not available in the sources

  The issue appears to be that you do not need also "deb" lines in your
  apt sources.list, not just "deb-src".

  It works now with the "deb" line for unstable being added.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: apt 0.8.16~exp5ubuntu14.2
  ProcVersionSignature: Ubuntu 3.2.0-9.16-generic-pae 3.2.1
  Uname: Linux 3.2.0-9-generic-pae i686
  ApportVersion: 1.90-0ubuntu2
  Architecture: i386
  Date: Wed Jan 18 14:59:14 2012
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427.1)
  SourcePackage: apt
  UpgradeStatus: Upgraded to precise on 2011-12-16 (33 days ago)

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