Aqui está o que eu recebo ao tentar instalar a atualização: primeiro recebo uma mensagem de janela com tudo isso:
W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/source/Sources 403 Forbidden , W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://extras.ubuntu.com/ubuntu/dists/precise/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://archive.canonical.com/ubuntu/dists/natty/partner/source/Sources 403 Forbidden , W:Failed to fetch http://archive.canonical.com/ubuntu/dists/natty/partner/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://archive.canonical.com/ubuntu/dists/natty/partner/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://archive.canonical.com/ubuntu/dists/precise/partner/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/ferramroberto/gnome3/ubuntu/dists/oneiric/main/source/Sources 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/ferramroberto/gnome3/ubuntu/dists/oneiric/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/ferramroberto/gnome3/ubuntu/dists/oneiric/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/dists/precise/main/source/Sources 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/dists/precise/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/dists/precise/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/tiheum/equinox/ubuntu/dists/precise/main/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/restricted/source/Sources 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/tiheum/equinox/ubuntu/dists/precise/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/main/source/Sources 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/tiheum/equinox/ubuntu/dists/precise/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/multiverse/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/universe/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/precise/main/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/restricted/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/precise/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/tualatrix/ppa/ubuntu/dists/precise/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://dl.google.com/linux/chrome/deb/dists/stable/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/dists/precise/main/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/universe/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/dists/precise/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/multiverse/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/stable/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://ppa.launchpad.net/ubuntu-audio-dev/ppa/ubuntu/dists/precise/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://dl.google.com/linux/talkplugin/deb/dists/stable/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/restricted/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/universe/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/multiverse/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/restricted/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/main/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/restricted/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/restricted/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/universe/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/multiverse/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/restricted/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/universe/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/multiverse/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/restricted/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/universe/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/natty-backports/multiverse/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/restricted/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/main/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/multiverse/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/universe/source/Sources 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/main/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/restricted/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/universe/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/multiverse/binary-amd64/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/main/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/restricted/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/universe/binary-i386/Packages 403 Forbidden , W:Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-security/multiverse/binary-i386/Packages 403 Forbidden , E:Some index files failed to download. They have been ignored, or old ones used instead.