The problem does not occur on a 32bits-only installation. Maybe that old bug is relative https://bugs.debian.org/cgi- bin/bugreport.cgi?bug=633825 ?
** Bug watch added: Debian Bug tracker #633825 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=633825 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1533554 Title: Duplicate package entries shown when listing by package origin To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt-xapian-index/+bug/1533554/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs