[Aptitude-devel] Bug#587775:

[Michał Kułach]

I had the same problem:

  # aptitude changelog python-virtualenv
  Err Changelog of python-virtualenv
  E: You must put some 'source' URIs in your sources.list
  E: Changelog download failed: Download queue destroyed.
  E: Couldn't find a changelog for python-virtualenv

But following works:

  # aptitude changelog python-virtualenv/testing
  Get: Changelog of python-virtualenv

After I've added 'APT::Default-Release "testing";' entry to  
/etc/apt/apt.conf, changelogs are fetched correctly:

  # aptitude changelog python-virtualenv
  Get: Changelog of python-virtualenv

My configuration files:
  # grep -v ^# /etc/apt/sources.list
  deb http://ftp.pl.debian.org/debian/ testing main contrib non-free
  deb http://ftp.pl.debian.org/debian/ unstable main contrib non-free
  deb http://ftp.pl.debian.org/debian/ experimental main contrib non-free

  # grep -v ^# /etc/apt/preferences
  Package: *
  Pin: release a=unstable
  Pin-Priority: 30

Thanks,
-- 
Michał Kułach