我试图在google colab上使用selenium，然后发生了一个错误。错误消息是错误的 "chromedriver' executable needs to be in PATH." 我在谷歌上搜索，找到了一个解决方案。解决办法如下：

!apt-get update
!apt install chromium-chromedriver
!cp /usr/lib/chromium-browser/chromedriver /usr/bin
!pip install selenium

options = webdriver.ChromeOptions()
options.add_argument('--headless')
options.add_argument('--no-sandbox')
options.add_argument('--disable-dev-shm-usage')

driver = webdriver.Chrome('chromedriver',options=options)

当我取下 --headless 选项时，发生以下错误。

WebDriverException: Message: unknown error: Chrome failed to start: exited abnormally.
  (unknown error: DevToolsActivePort file doesn't exist)
  (The process started from chrome location /usr/bin/chromium-browser is no longer running, so ChromeDriver is assuming that Chrome has crashed.)

如果没有 --headless 选项