title: how to install scrapy on ubuntu?
body: <p>I know that intall the scrapy should install the w3lib first,so I install the w3lib firstly,but when I import the scrapy in python ide,the program is crashed.
  the error:</p>
  
  <pre><code>creating Twisted.egg-info
  
  writing requirements to Twisted.egg-info\requires.txt
  
  writing Twisted.egg-info\PKG-INFO
  
  writing top-level names to Twisted.egg-info\top_level.txt
  
  writing dependency_links to Twisted.egg-info\dependency_links.txt
  
  writing manifest file 'Twisted.egg-info\SOURCES.txt'
  
  warning: manifest_maker: standard file '-c' not found
  
  
  
  reading manifest file 'Twisted.egg-info\SOURCES.txt'
  
  writing manifest file 'Twisted.egg-info\SOURCES.txt'
  
  copying twisted\internet\_sigchld.c -&gt; build\lib.win-amd64-2.7\twisted\internet
  
  creating build\lib.win-amd64-2.7\twisted\internet\iocpreactor\iocpsupport
  
  copying twisted\internet/iocpreactor/iocpsupport\iocpsupport.c -&gt; build\lib.win-amd64-2.7\twisted\internet/iocpreactor/i
  ocpsupport
  
  copying twisted\internet/iocpreactor/iocpsupport\winsock_pointers.c -&gt; build\lib.win-amd64-2.7\twisted\internet/iocpreac
  tor/iocpsupport
  
  copying twisted\python\_epoll.c -&gt; build\lib.win-amd64-2.7\twisted\python
  
  copying twisted\python\_initgroups.c -&gt; build\lib.win-amd64-2.7\twisted\python
  
  copying twisted\python\sendmsg.c -&gt; build\lib.win-amd64-2.7\twisted\python
  
  copying twisted\runner\portmap.c -&gt; build\lib.win-amd64-2.7\twisted\runner
  
  copying twisted\test\raiser.c -&gt; build\lib.win-amd64-2.7\twisted\test
  
  running build_ext
  </code></pre>
  
  <p>What's wrong?</p>