Mine

richard@richard-VGN-FZ430E:~$ cd /var/lib/apt/lists ; ls
extras.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages
extras.ubuntu.com_ubuntu_dists_natty_main_i18n_Index
extras.ubuntu.com_ubuntu_dists_natty_main_i18n_Translation-en
extras.ubuntu.com_ubuntu_dists_natty_main_i18n_Translation-en%5fUS
extras.ubuntu.com_ubuntu_dists_natty_main_source_Sources
extras.ubuntu.com_ubuntu_dists_natty_Release
extras.ubuntu.com_ubuntu_dists_natty_Release.gpg
lock
partial
security.ubuntu.com_ubuntu_dists_natty-security_main_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_natty-security_main_i18n_Index
security.ubuntu.com_ubuntu_dists_natty-security_main_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_natty-security_main_i18n_Translation-en%5fUS
security.ubuntu.com_ubuntu_dists_natty-security_main_source_Sources
security.ubuntu.com_ubuntu_dists_natty-security_multiverse_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_natty-security_multiverse_i18n_Index
security.ubuntu.com_ubuntu_dists_natty-security_multiverse_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_natty-security_multiverse_i18n_Translation-en%5fUS
security.ubuntu.com_ubuntu_dists_natty-security_multiverse_source_Sources
security.ubuntu.com_ubuntu_dists_natty-security_Release
security.ubuntu.com_ubuntu_dists_natty-security_Release.gpg
security.ubuntu.com_ubuntu_dists_natty-security_restricted_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_natty-security_restricted_i18n_Index
security.ubuntu.com_ubuntu_dists_natty-security_restricted_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_natty-security_restricted_i18n_Translation-en%5fUS
security.ubuntu.com_ubuntu_dists_natty-security_restricted_source_Sources
security.ubuntu.com_ubuntu_dists_natty-security_universe_binary-i386_Packages
security.ubuntu.com_ubuntu_dists_natty-security_universe_i18n_Index
security.ubuntu.com_ubuntu_dists_natty-security_universe_i18n_Translation-en
security.ubuntu.com_ubuntu_dists_natty-security_universe_i18n_Translation-en%5fUS
security.ubuntu.com_ubuntu_dists_natty-security_universe_source_Sources
us.archive.ubuntu.com_ubuntu_dists_natty_multiverse_binary-i386_Packages
us.archive.ubuntu.com_ubuntu_dists_natty_multiverse_i18n_Index
us.archive.ubuntu.com_ubuntu_dists_natty_multiverse_i18n_Translation-en
us.archive.ubuntu.com_ubuntu_dists_natty_multiverse_i18n_Translation-en%5fUS
us.archive.ubuntu.com_ubuntu_dists_natty_multiverse_source_Sources
us.archive.ubuntu.com_ubuntu_dists_natty_Release
us.archive.ubuntu.com_ubuntu_dists_natty_Release.gpg
us.archive.ubuntu.com_ubuntu_dists_natty_restricted_binary-i386_Packages
us.archive.ubuntu.com_ubuntu_dists_natty_restricted_i18n_Index
us.archive.ubuntu.com_ubuntu_dists_natty_restricted_i18n_Translation-en
us.archive.ubuntu.com_ubuntu_dists_natty_restricted_i18n_Translation-en%5fUS
us.archive.ubuntu.com_ubuntu_dists_natty_restricted_source_Sources
us.archive.ubuntu.com_ubuntu_dists_natty_universe_binary-i386_Packages
us.archive.ubuntu.com_ubuntu_dists_natty_universe_i18n_Index
us.archive.ubuntu.com_ubuntu_dists_natty_universe_i18n_Translation-en
us.archive.ubuntu.com_ubuntu_dists_natty_universe_i18n_Translation-en%5fUS
us.archive.ubuntu.com_ubuntu_dists_natty_universe_source_Sources
us.archive.ubuntu.com_ubuntu_dists_natty-updates_main_binary-i386_Packages
us.archive.ubuntu.com_ubuntu_dists_natty-updates_main_i18n_Index
us.archive.ubuntu.com_ubuntu_dists_natty-updates_main_i18n_Translation-en
us.archive.ubuntu.com_ubuntu_dists_natty-updates_main_i18n_Translation-en%5fUS
us.archive.ubuntu.com_ubuntu_dists_natty-updates_main_source_Sources
us.archive.ubuntu.com_ubuntu_dists_natty-updates_multiverse_binary-i386_Packages
us.archive.ubuntu.com_ubuntu_dists_natty-updates_multiverse_i18n_Index
us.archive.ubuntu.com_ubuntu_dists_natty-updates_multiverse_i18n_Translation-en
us.archive.ubuntu.com_ubuntu_dists_natty-updates_multiverse_i18n_Translation-en%5fUS
us.archive.ubuntu.com_ubuntu_dists_natty-updates_multiverse_source_Sources
us.archive.ubuntu.com_ubuntu_dists_natty-updates_Release
us.archive.ubuntu.com_ubuntu_dists_natty-updates_Release.gpg
us.archive.ubuntu.com_ubuntu_dists_natty-updates_restricted_binary-i386_Packages
us.archive.ubuntu.com_ubuntu_dists_natty-updates_restricted_i18n_Index
us.archive.ubuntu.com_ubuntu_dists_natty-updates_restricted_i18n_Translation-en
us.archive.ubuntu.com_ubuntu_dists_natty-updates_restricted_i18n_Translation-en%5fUS
us.archive.ubuntu.com_ubuntu_dists_natty-updates_restricted_source_Sources
us.archive.ubuntu.com_ubuntu_dists_natty-updates_universe_binary-i386_Packages
us.archive.ubuntu.com_ubuntu_dists_natty-updates_universe_i18n_Index
us.archive.ubuntu.com_ubuntu_dists_natty-updates_universe_i18n_Translation-en
us.archive.ubuntu.com_ubuntu_dists_natty-updates_universe_i18n_Translation-en%5fUS
us.archive.ubuntu.com_ubuntu_dists_natty-updates_universe_source_Sources
richard@richard-VGN-FZ430E:/var/lib/apt/lists$