pyvirtualdisplay on Amazon EC2 instance
Question: I am trying to run selenium on Amazon EC2. I am using pyvirtualdisplay as xvfb
wrapper. I ran the following commands in python.

    
    
    from pyvirtualdisplay import Display
    from selenium import webdriver
    display = Display(visible=0, size=(1024, 768))
    display.start()
    

Everything goes fine till now.  
But when I do:

    
    
    driver = webdriver.Firefox()
    

I get this error:

    
    
    Traceback (most recent call last):
    File "<stdin>", line 1, in <module>
    File "/usr/lib/python2.6/site-   packages/selenium/webdriver/firefox/webdriver.py", line 59, in __init__
    self.binary, timeout),
    File "/usr/lib/python2.6/site-packages/selenium/webdriver/firefox/extension_connection.py", line 47, in  __init__
    self.binary.launch_browser(self.profile)
    File "/usr/lib/python2.6/site-packages/selenium/webdriver/firefox/firefox_binary.py", line 66, in launch_browser
    self._wait_until_connectable()
    File "/usr/lib/python2.6/site- packages/selenium/webdriver/firefox/firefox_binary.py", line 100, in _wait_until_connectable
    raise WebDriverException("The browser appears to have exited "
    selenium.common.exceptions.WebDriverException: Message: The browser   appears to have exited before we could connect. If you specified a    log_file in the FirefoxBinary constructor, check it for details.
    


Answer: After spending many hours on the internet searching for solutions and trying
every possible thing out, one thing which worked for me is this.  
<http://superuser.com/questions/870702/aws-ec2-linux-headless-firefox-issue-
xvfb-undefined-symbol-pixman-glyph-cache>

As the answer says:  
It is trying to load wring pixman so. Delete /usr/local/lib/libpixman-1.so.0
and try again, it will make Xvfb use distribution pixman library which has
this symbol.

