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I am unable to install updates because the following Packages cannot be authenticated:

libudev1 libxml2 libasound2 google-chrome-stable libgudev-1.0-0 libtiff5
  linux-image-3.8.0-19-generic libsystemd-daemon0 systemd-services
  nautilus-sendto-empathy gnome-control-center-signon libaccount-plugin-1.0-0
  mcp-account-manager-uoa account-plugin-yahoo account-plugin-salut
  account-plugin-jabber account-plugin-aim empathy empathy-common duplicity
  firefox-globalmenu firefox firefox-gnome-support firefox-locale-en
  flashplugin-installer gir1.2-gudev-1.0 linux-headers-3.8.0-19
  linux-headers-3.8.0-19-generic linux-image-extra-3.8.0-19-generic
  linux-libc-dev python-libxml2 telepathy-idle thunderbird-globalmenu
  thunderbird thunderbird-gnome-support
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1 Answer 1

Reset to default
2

Try the follwing commands in a terminal:

sudo apt-key update
sudo apt-get update
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