title: Package not found with apt-get install
body: <p>I am trying to install packages g++, libnss3-dev,libpulse-dev,libjpeg62-dev
  libxv-dev,libgtk2.0-dev,libexpat1-dev in order to run AppRTCDemo. I am writing:</p>
  
  <pre><code>apt-get update
  apt-get install g++
  </code></pre>
  
  <p>And I am getting the message that package can not be found. The same is for the other packages. I cant not find rpm-s ether. The Linux version is <strong>Linux 3.18.1-pclos1 i686</strong>.</p>