我正在尝试opencv-2-4-9在教程中安装--in-ubuntu-14-04 ..
sudo apt-get install build-essential libgtk2.0-dev libjpeg-dev libtiff4-dev libjasper-dev libopenexr-dev cmake python-dev python-numpy python-tk libtbb-dev libeigen3-dev yasm libfaac-dev libopencore-amrnb-dev libopencore-amrwb-dev libtheora-dev libvorbis-dev libxvidcore-dev libx264-dev libqt4-dev libqt4-opengl-dev sphinx-common texlive-latex-extra libv4l-dev libdc1394-22-dev libavcodec-dev libavformat-dev libswscale-dev default-jdk ant libvtk5-qt4-dev
输出是：
reading packages lists Done
Building dependency tree
Reading state information Done
E: unable to locate package libfaac-dev
libfaac-dev为了成功安装，定位/安装是否重要，如果是，我现在应该做什么？