(aptitude 0.6.3-3.2) I ran into this after adding wheezy and sid repositories and configuring pinning with the following preferences file, though not immediately (when trying to upgrade xserver-xorg-input-synaptics):
Package: * Pin: release n=squeeze Pin-Priority: 900 Package: * Pin: release n=wheezy Pin-Priority: 500 Package: * Pin: release n=sid Pin-Priority: 10 -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org