Python 2.7 ubuntu 16.04中的driver=webdriver.Chrome（）pyvirtualdisplay和selenium包出错

我在Ubuntu 16.04中安装了pyvirtualdisplay和selenium软件包。 我想从网页中获取数据。 我试过这个密码

from pyvirtualdisplay import Display
from selenium import webdriver
display = Display(visible=0, size=(800, 600))
display.start()
driver = webdriver.Chrome()
driver.get('http://christopher.su')
print driver.title 

但是当我运行'driver=webdriver.Chrome（）'时，我得到了这个错误

>>> driver = webdriver.Chrome()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/nextremer/.local/lib/python2.7/site-packages/selenium/webdriver/chrome/webdriver.py", line 69, in __init__
    desired_capabilities=desired_capabilities)
  File "/home/nextremer/.local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 92, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "/home/nextremer/.local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 179, in start_session
    response = self.execute(Command.NEW_SESSION, capabilities)
  File "/home/nextremer/.local/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 234, in execute
    response = self.command_executor.execute(driver_command, params)
  File "/home/nextremer/.local/lib/python2.7/site-packages/selenium/webdriver/remote/remote_connection.py", line 407, in execute
    return self._request(command_info[0], url, body=data)
  File "/home/nextremer/.local/lib/python2.7/site-packages/selenium/webdriver/remote/remote_connection.py", line 439, in _request
    resp = self._conn.getresponse()
  File "/usr/lib/python2.7/httplib.py", line 1136, in getresponse
    response.begin()
  File "/usr/lib/python2.7/httplib.py", line 453, in begin
    version, status, reason = self._read_status()
  File "/usr/lib/python2.7/httplib.py", line 417, in _read_status
    raise BadStatusLine(line)
httplib.BadStatusLine: ''

>driver=webdriver.Chrome（）
回溯（最近一次呼叫最后一次）：
文件“”，第1行，在
文件“/home/nextremer/.local/lib/python2.7/site packages/selenium/webdriver/chrome/webdriver.py”，第69行，在__
期望的_能力=期望的_能力）
文件“/home/nextremer/.local/lib/python2.7/site packages/selenium/webdriver/remote/webdriver.py”，第92行，在__
self.start\u会话（所需的\u功能、浏览器\u配置文件）
文件“/home/nextremer/.local/lib/python2.7/site packages/selenium/webdriver/remote/webdriver.py”，第179行，在启动会话中
响应=self.execute（Command.NEW_会话，功能）
文件“/home/nextremer/.local/lib/python2.7/site packages/selenium/webdriver/remote/webdriver.py”，执行中第234行
响应=self.command\u executor.execute（driver\u command，params）
文件“/home/nextremer/.local/lib/python2.7/site packages/selenium/webdriver/remote/remote_connection.py”，第407行，在execute中
返回self.\u请求（命令信息[0]，url，正文=数据）
文件“/home/nextremer/.local/lib/python2.7/site packages/selenium/webdriver/remote/remote\u connection.py”，请求中第439行
resp=self.\u conn.getresponse（）
文件“/usr/lib/python2.7/httplib.py”，第1136行，在getresponse中
response.begin（）
文件“/usr/lib/python2.7/httplib.py”，第453行，在begin中
版本、状态、原因=self.\u读取\u状态（）
文件“/usr/lib/python2.7/httplib.py”，第417行，处于读取状态
升起状态行（行）
httplib.BadStatusLine:“”