title: how to install boost 1.40 on Ubuntu 10.04?
body: <p>I have downloaded the file from <a href="http://sourceforge.net/projects/boost/files/boost/1.40.0/boost_1_40_0.tar.gz/download" rel="nofollow">http://sourceforge.net/projects/boost/files/boost/1.40.0/boost_1_40_0.tar.gz/download</a></p>
  
  <p>However, I don't know how to install it after downloading the file.</p>