https://askubuntu.com/questions/195782/how-to-view-a-list-of-packages-that-were-manually-installed-without-their-depend http://ask.debian.net/questions/how-to-get-a-list-of-manually-installed-packages https://askubuntu.com/questions/2389/generating-list-of-manually-installed-packages-and-querying-individual-packages
Try apt-mark showmanual(Anyway if memory serves me everything that came on the Trisquel ISO were marked manual).