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



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