title: Qt 5.4.0 install failing on libGL.so.1, but libgl-dev and ibglu-dev already installed
body: <p>I am trying to install (offline installer) Qt 5.4.0 on linux 14.04 "Trusty Tahr" and I keep getting the error message:</p>
  
  <p><em>Warning: /home/bd-01/Qt5.4.0//Tools/QtCreator/bin/sdktool: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory</em></p>
  
  <p>I've googled and searched and the answer seems to be to install <strong>libgl-dev</strong> and <strong>libglu-dev</strong>  but they are already installed, per the console messages I see when installing each:</p>
  
  <h2><strong>libgl-dev</strong></h2>
  
  <pre><code>`Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Note, selecting 'libgl1-mesa-dev' instead of 'libgl-dev'
  libgl1-mesa-dev is already the newest version.
  libgl1-mesa-dev set to manually installed.
  0 upgraded, 0 newly installed, 0 to remove and 598 not upgraded.`
  </code></pre>
  
  <h2><strong>libglu-dev</strong></h2>
  
  <pre><code>`Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Note, selecting 'libglu1-mesa-dev' instead of 'libglu1-mesa-dev' 
  libglu1-mesa-dev is already the newest version.
  libglu1-mesa-dev set to manually installed.
  0 upgraded, 0 newly installed, 0 to remove and 598 not upgraded.`
  </code></pre>
  
  <p>So I see 2 possible problems but don't know how to adress either.</p>
  
  <ol>
  <li>'libglu1-mesa-dev' is being substituted for 'libglu1-mesa-dev'</li>
  <li>libglu1-mesa-dev set to manually installed</li>
  </ol>
  
  <p>Can anyone help me understand what is going on here?</p>