Comment 11 for bug 35836

I don't know what aptitude is doing, but if you put your package on hold using dpkg (echo "packagename hold" | sudo dpkg --set-selections), update-manager and apt-get don't suggest it for upgrade. Also, doing only the dpkg --set-selections thing doesn't seem to affect aptitude; if you want to use it, too, you need to do the aptitude specific hold operation in addition to the one with dpkg.

This might be more of an aptitude issue.