Comment 5 for bug 829200

@Robert, thank you!

@Brian, in case you still need the output:

$ grep '^Date:' /var/lib/apt/lists/*
/var/lib/apt/lists/archive.canonical.com_ubuntu_dists_natty_Release:Date: Tue, 09 Aug 2011 20:17:05 UTC
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-backports_Release:Date: Mon, 22 Aug 2011 14:17:02 UTC
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_Release:Date: Tue, 26 Apr 2011 12:16:58 UTC
/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty-updates_Release:Date: Tue, 23 Aug 2011 20:20:58 UTC
/var/lib/apt/lists/dl.google.com_linux_talkplugin_deb_dists_stable_Release:Date: Wed, 10 Aug 2011 18:14:44 +0000
/var/lib/apt/lists/extras.ubuntu.com_ubuntu_dists_natty_Release:Date: Tue, 29 Mar 2011 18:21:29 UTC
grep: /var/lib/apt/lists/lock: Permission denied
/var/lib/apt/lists/packages.medibuntu.org_dists_natty_InRelease:Date: Sat, 09 Apr 2011 19:20:24 UTC
/var/lib/apt/lists/ppa.launchpad.net_caffeine-developers_ppa_ubuntu_dists_natty_Release:Date: Sat, 25 Jun 2011 22:46:05 UTC
/var/lib/apt/lists/ppa.launchpad.net_git-core_ppa_ubuntu_dists_natty_Release:Date: Tue, 05 Jul 2011 7:07:33 UTC
/var/lib/apt/lists/ppa.launchpad.net_libreoffice_ppa_ubuntu_dists_natty_Release:Date: Fri, 08 Jul 2011 20:09:02 UTC
/var/lib/apt/lists/ppa.launchpad.net_sevenmachines_flash_ubuntu_dists_natty_Release:Date: Wed, 10 Aug 2011 5:51:50 UTC
/var/lib/apt/lists/ppa.launchpad.net_transmissionbt_ppa_ubuntu_dists_natty_Release:Date: Sun, 24 Jul 2011 21:31:50 UTC
/var/lib/apt/lists/rishavt.github.com_nfuploader_apt_dists_natty_InRelease:Date: Wed, 25 May 2011 04:48:53 UTC
/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_natty-security_Release:Date: Tue, 23 Aug 2011 13:07:31 UTC