Comment 1 for bug 1471903

phablet@ubuntu-phablet:~$ ls /var/lib/apt/lists/
lock
partial
ports.ubuntu.com_ubuntu-ports_dists_vivid_main_binary-armhf_Packages
ports.ubuntu.com_ubuntu-ports_dists_vivid_main_i18n_Translation-en
ports.ubuntu.com_ubuntu-ports_dists_vivid_Release
ports.ubuntu.com_ubuntu-ports_dists_vivid_Release.gpg
ports.ubuntu.com_ubuntu-ports_dists_vivid_restricted_binary-armhf_Packages
ports.ubuntu.com_ubuntu-ports_dists_vivid_restricted_i18n_Translation-en
ports.ubuntu.com_ubuntu-ports_dists_vivid_universe_binary-armhf_Packages
ports.ubuntu.com_ubuntu-ports_dists_vivid_universe_i18n_Translation-en
ppa.launchpad.net_ci-train-ppa-service_stable-phone-overlay_ubuntu_dists_vivid_main_binary-armhf_Packages
ppa.launchpad.net_ci-train-ppa-service_stable-phone-overlay_ubuntu_dists_vivid_main_i18n_Translation-en
ppa.launchpad.net_ci-train-ppa-service_stable-phone-overlay_ubuntu_dists_vivid_Release
ppa.launchpad.net_ci-train-ppa-service_stable-phone-overlay_ubuntu_dists_vivid_Release.gpg

It looks like -security is also missing.