我正在尝试运行此脚本：

https://github.com/Chillee/coursera-dl-
all

但是，脚本在此行失败，session = webdriver.PhantomJS()并显示以下错误

Traceback (most recent call last):
  File "dl_all.py", line 236, in <module>
    session = webdriver.PhantomJS()
  File "/home/<user>/.local/lib/python2.7/site-packages/selenium/webdriver/phantomjs/webdriver.py", line 51, in __init__
    self.service.start()
  File "/home/<user>/.local/lib/python2.7/site-packages/selenium/webdriver/common/service.py", line 69, in start
    os.path.basename(self.path), self.start_error_message)
selenium.common.exceptions.WebDriverException: Message: 'phantomjs' executable needs to be in PATH.

Exception AttributeError: "'Service' object has no attribute 'process'" in <bound method Service.__del__ of <selenium.webdriver.phantomjs.service.Service object at 0x7f6f632864d0>> ignored

如何将phantomjs添加到PATH？我正在运行ubuntu 16.04并通过安装seleniumnpm install selenium。