apt-mark showmanual >installed_packages.txt
apt-mark showauto >>installed_packages.txt

for PACKAGE in $( sort installed_packages.txt ); do
    apt-cache depends ${PACKAGE} --important -q --installed | awk '/epends:/ {print $2}' >>dependencies_all.txt
done
sort -u dependencies_all.txt > dependencies_uniq.txt

cat dependencies_uniq.txt | xargs sudo apt-mark auto