dpkg, dpkg-query, dselect

• apt-get and apt-cache deal with the repositories; dpkg and dselect deal with YOUR system

• dpkg --get-selections dpkg --get-selections > /etc/dpkg.packagelist.txt dpkg --set-selections < /etc/dpkg.packagelist.txt dselect → press I

• dpkg-query to find installed versions dpkg-query --show apache2