Erro na atualização: instalação de pacotes não confiáveis

[Crazy Cat]

Tentei atualizar o Ubuntu 12.04 LTS, e apareceu esta mensagem "updater manager : Necessita instalação de pacotes não confiáveis : A ação deve requerer a instalação de pacotes de fontes não confiáveis.

Eu acho que é algo com o source.lis.
Apareceu isso no relatório:
aisleriot app-install-data apport apport-gtk apt apt-transport-https apt-utils base-files brasero brasero-cdrkit brasero-common command-not-found command-not-found-data compizconfig-backend-gconf console-setup cups-filters dkms empathy empathy-common eog example-content file-roller firefox firefox-globalmenu firefox-gnome-support firefox-locale-en firefox-locale-pt flashplugin-installer fontconfig fontconfig-config gcalctool gedit gedit-common gir1.2-dbusmenu-glib-0.4 gir1.2-dbusmenu-gtk-0.4 gir1.2-gdkpixbuf-2.0 gir1.2-gtk-3.0 gir1.2-gtksource-3.0 gir1.2-pango-1.0 gir1.2-soup-2.4 gir1.2-totem-plparser-1.0 gir1.2-vte-2.90 glib-networking glib-networking-common glib-networking-services gnome-accessibility-themes gnome-control-center gnome-control-center-data gnome-desktop3-data gnome-games-data gnome-nettool gnome-screensaver gnome-screenshot gnome-session gnome-session-bin gnome-session-common gnome-settings-daemon gnome-sudoku gnome-system-log gnome-system-monitor gnome-terminal gnome-terminal-data gnome-user-guide gnomine grub-common grub-pc grub-pc-bin grub2-common gsettings-desktop-schemas gucharmap gvfs gvfs-backends gvfs-bin gvfs-common gvfs-daemons gvfs-fuse gvfs-libs indicator-datetime indicator-sound initramfs-tools initramfs-tools-bin kerneloops-daemon keyboard-configuration language-pack-en language-pack-en-base language-pack-gnome-en language-pack-gnome-en-base language-pack-gnome-pt language-pack-gnome-pt-base language-pack-pt language-pack-pt-base language-selector-common language-selector-gnome libapt-inst1.4 libapt-pkg4.12 libbrasero-media3-1 libc-bin libc-dev-bin libc6 libc6-dev libcupsfilters1 libdbusmenu-glib4 libdbusmenu-gtk3-4 libdbusmenu-gtk4 libfontconfig1 libgail-3-0 libgdk-pixbuf2.0-0 libgdk-pixbuf2.0-common libglib2.0-0 libglib2.0-bin libglib2.0-data libgnome-control-center1 libgnome-desktop-3-2 libgtk-3-0 libgtk-3-bin libgtk-3-common libgtksourceview-3.0-0 libgtksourceview-3.0-common libgucharmap-2-90-7 liblightdm-gobject-1-0 libmusicbrainz3-6 libnautilus-extension1a libpango1.0-0 libpython2.7 librsvg2-2 librsvg2-common libsoup-gnome2.4-1 libsoup2.4-1 libssl1.0.0 libtotem-plparser17 libunity-core-5.0-5 libusb-1.0-0 libvte-2.90-9 libvte-2.90-common libyelp0 lightdm linux-generic-pae linux-headers-3.2.0-24 linux-headers-3.2.0-24-generic-pae linux-headers-generic-pae linux-image-3.2.0-24-generic-pae linux-image-generic-pae linux-libc-dev mahjongg mousetweaks multiarch-support nautilus nautilus-data nautilus-sendto-empathy openssl python python-apport python-apt python-apt-common python-minimal python-problem-report python2.7 python2.7-minimal sessioninstaller simple-scan syslinux-legacy transmission-common transmission-gtk ttf-wqy-microhei ubuntu-docs unity unity-common unity-greeter unity-services update-manager update-manager-core update-notifier update-notifier-common upstart usb-creator-common usb-creator-gtk vino whoopsie xul-ext-ubufox yelp yelp-xsl

[Tota]

Ola

Você postou aparentemente os pacotes a serem atualizados, mas não postou a mensagem de erro.

entre em terminal e digite

Código Selecionar Expandir

sudo apt-get update

Poste aqui o resultado completo da saída do comando para o forum poderr analisar

[]'s