docs/quickstart.html: note dependency on python development files, e.g. on Ubuntu

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     <h2>Install Python</h2>
 
-    <p>Check if you already have an adequate version of Python installed by running <cite>python -V</cite>.  Python&nbsp;v2.4 (v2.4.4 or greater), Python&nbsp;v2.5 or Python&nbsp;v2.6 will work. Python&nbsp;v3 does not work. On Windows, we recommend the use of Python&nbsp;v2.6 (native, not Cygwin). If you don't have one of these versions of Python installed, then follow the instructions on <a href="http://www.python.org/download/releases/2.6.5/">the Python download page</a> to download and install Python&nbsp;v2.6. Make sure that the path to the installation directory has no spaces in it (e.g. on Windows, do not install Python in the "<tt>Program Files</tt>" directory).</p>
+    <p>Check if you already have an adequate version of Python installed by running <cite>python -V</cite>.  Python&nbsp;v2.4 (v2.4.4 or greater), Python&nbsp;v2.5 or Python&nbsp;v2.6 will work. Python&nbsp;v3 does not work. On Windows, we recommend the use of Python&nbsp;v2.6 (native, not Cygwin). If your OS distribution packages Python development files such as <code>python.h</code> separately, you will also need those; for example, the <code>python-dev</code> package is needed on Ubuntu. If you don't have one of these versions of Python installed, then follow the instructions on <a href="http://www.python.org/download/releases/2.6.5/">the Python download page</a> to download and install Python&nbsp;v2.6, including development files. Make sure that the path to the installation directory has no spaces in it (e.g. on Windows, do not install Python in the "<tt>Program Files</tt>" directory).</p>
     <p>If you are on Windows, you now must manually install the pywin32 package from <a href="http://sourceforge.net/projects/pywin32/files/">the pywin32 site</a> before getting Tahoe-LAFS. Make sure to get the correct file for the version of Python you are using &mdash; e.g. ending in "py2.6.exe" for Python&nbsp;v2.6. If using 64-bit Windows, the file should have "win-amd64" in its name.</p>
 
     <h2>Get Tahoe-LAFS</h2>