I installed ldnsutils with # cat /etc/apt/apt.conf.d/90test Binary::apt-get::APT::Keep-Downloaded-Packages "0";
and I got # ls /var/cache/apt/archives/ lock partial # I installed dnsutils with # cat /etc/apt/apt.conf.d/90test Binary::apt-get::APT::Keep-Downloaded-Packages "1"; and I got # ls /var/cache/apt/archives/ bind9-host_1%3a9.10.3.dfsg.P4-10.1_amd64.deb libbind9-140_1%3a9.10.3.dfsg.P4-10.1_amd64.deb libisc160_1%3a9.10.3.dfsg.P4-10.1_amd64.deb liblwres141_1%3a9.10.3.dfsg.P4-10.1_amd64.deb dnsutils_1%3a9.10.3.dfsg.P4-10.1_amd64.deb libdns162_1%3a9.10.3.dfsg.P4-10.1_amd64.deb libisccc140_1%3a9.10.3.dfsg.P4-10.1_amd64.deb lock geoip-database_20160812-1_all.deb libgeoip1_1.6.9-2_amd64.deb libisccfg140_1%3a9.10.3.dfsg.P4-10.1_amd64.deb partial # So it was a question of knowing that "Binary::apt::APT::Keep-Downloaded-Packages" controls the behavior of apt and "Binary::apt-get::APT::Keep-Downloaded-Packages" controls the behavior of apt-get.
