apt-offline how to

update and upgrade

apt-offline set apt-offline.sig
apt-offline get apt-offline.sig -d [directory] --threads 5

apt-offline install [directory]
apt-get upgrade

install package

apt-offline set debian-install.sig --install-packages mc hdparm
apt-offline get debian-install.sig -d [directory] --threads 5

apt-offline install [directory]
apt-get install mc hdparm

misc

apt-key exportall | gpg --no-default-keyring --import --keyring /etc/apt/trusted.gpg

http://www.debian-administration.org/article/648/Offline_Package_Management_for_APT

http://blog.sleeplessbeastie.eu/2014/01/30/how-to-manage-packages-on-an-off-line-debian-system/