raven301@raven301-laptop:~/bashscripts$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree... Done
The following packages have been kept back:
  lftp libcairo2 libraw1394-dev
The following packages will be upgraded:
  libdrm2 libfaac0 libgl1-mesa libgl1-mesa-dev libgl1-mesa-dri libglu1-mesa libglu1-mesa-dev libnm-util0 libpoppler1
  libpoppler1-qt libtunepimp2c2a libxcomposite1 libxfixes-dev libxfixes3 libxss1 mesa-common-dev mesa-utils
  network-manager network-manager-gnome poppler-utils w32codecs x11proto-fixes-dev xserver-xorg-driver-i810
23 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.
Need to get 27.4MB of archives.
After unpacking, 709kB disk space will be freed.
Do you want to continue [Y/n]? y
WARNING: The following packages cannot be authenticated!
  libfaac0
Install these packages without verification [y/N]?