ubuntu@web-s2:~$ sudo apt-get update
Hit http://mirrors.ocf.berkeley.edu precise Release.gpg
Hit http://mirrors.ocf.berkeley.edu precise-updates Release.gpg
Hit http://mirrors.ocf.berkeley.edu precise Release
Hit http://mirrors.ocf.berkeley.edu precise-updates Release
Hit http://mirrors.ocf.berkeley.edu precise/main Sources
Hit http://mirrors.ocf.berkeley.edu precise/universe Sources
Hit http://mirrors.ocf.berkeley.edu precise/main amd64 Packages
Hit http://security.ubuntu.com precise-security Release.gpg
Hit http://mirrors.ocf.berkeley.edu precise/universe amd64 Packages
Hit http://mirrors.ocf.berkeley.edu precise/main i386 Packages
Hit http://mirrors.ocf.berkeley.edu precise/universe i386 Packages
Hit http://mirrors.ocf.berkeley.edu precise/main TranslationIndex
Hit http://security.ubuntu.com precise-security Release
Hit http://mirrors.ocf.berkeley.edu precise/universe TranslationIndex
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://mirrors.ocf.berkeley.edu precise-updates/main Sources
Hit http://mirrors.ocf.berkeley.edu precise-updates/universe Sources
Hit http://mirrors.ocf.berkeley.edu precise-updates/main amd64 Packages
Hit http://security.ubuntu.com precise-security/main Sources
Hit http://mirrors.ocf.berkeley.edu precise-updates/universe amd64 Packages
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://mirrors.ocf.berkeley.edu precise-updates/main i386 Packages
Hit http://security.ubuntu.com precise-security/universe Sources
Hit http://mirrors.ocf.berkeley.edu precise-updates/universe i386 Packages
Hit http://mirrors.ocf.berkeley.edu precise-updates/main TranslationIndex
Hit http://mirrors.ocf.berkeley.edu precise-updates/universe TranslationIndex
Hit http://mirrors.ocf.berkeley.edu precise/main Translation-en
Hit http://security.ubuntu.com precise-security/main amd64 Packages
Hit http://mirrors.ocf.berkeley.edu precise/universe Translation-en
Hit http://ppa.launchpad.net precise Release.gpg
Hit http://mirrors.ocf.berkeley.edu precise-updates/main Translation-en
Hit http://mirrors.ocf.berkeley.edu precise-updates/universe Translation-en
Hit http://security.ubuntu.com precise-security/universe amd64 Packages
Hit http://ppa.launchpad.net precise Release
Hit http://ppa.launchpad.net precise Release
Hit http://security.ubuntu.com precise-security/main TranslationIndex
Hit http://ppa.launchpad.net precise Release
Hit http://security.ubuntu.com precise-security/universe TranslationIndex
Hit http://ppa.launchpad.net precise/main amd64 Packages
Hit http://ppa.launchpad.net precise/main i386 Packages
Hit http://security.ubuntu.com precise-security/main Translation-en
Hit http://security.ubuntu.com precise-security/universe Translation-en
Hit http://ppa.launchpad.net precise/main TranslationIndex
Err http://security.ubuntu.com precise-security/main i386 Packages
  404  Not Found [IP: 91.189.91.15 80]
Hit http://ppa.launchpad.net precise/main amd64 Packages
Err http://security.ubuntu.com precise-security/universe i386 Packages
  404  Not Found [IP: 91.189.91.15 80]
Hit http://ppa.launchpad.net precise/main i386 Packages
Hit http://ppa.launchpad.net precise/main TranslationIndex
Hit http://ppa.launchpad.net precise/main amd64 Packages
Hit http://ppa.launchpad.net precise/main i386 Packages
Hit http://ppa.launchpad.net precise/main TranslationIndex
Hit http://ppa.launchpad.net precise/main Translation-en
Hit http://ppa.launchpad.net precise/main Translation-en
Hit http://ppa.launchpad.net precise/main Translation-en
W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/main/binary-i386/Packages  404  Not Found [IP: 91.189.91.15 80]

W: Failed to fetch http://security.ubuntu.com/ubuntu/dists/precise-security/universe/binary-i386/Packages  404  Not Found [IP: 91.189.91.15 80]

E: Some index files failed to download. They have been ignored, or old ones used instead.