我正在使用Ubuntu 16.04

Timed out waiting 45 seconds for Firefox to start.
Build info: version: '3.7.1', revision: '8a0099a', time: '2017-11-06T21:07:31.527Z'
System info: host: 'supranimbus-Inspiron-3250', ip: '127.0.1.1', os.name: 'Linux', os.arch: 'amd64', os.version: '4.10.0-40-generic', java.version: '1.8.0_151'
Driver info: driver.version: FirefoxDriver
    at org.openqa.selenium.firefox.XpiDriverService.waitUntilAvailable(XpiDriverService.java:131)
    at org.openqa.selenium.firefox.XpiDriverService.start(XpiDriverService.java:116)
    at org.openqa.selenium.remote.service.DriverCommandExecutor.execute(DriverCommandExecutor.java:79)
    at org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:600)
    at org.openqa.selenium.remote.RemoteWebDriver.startSession(RemoteWebDriver.java:219)
    at org.openqa.selenium.remote.RemoteWebDriver.<init>(RemoteWebDriver.java:142)
    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:120)
    at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:98)
    at facedoxmain.FaceDox.InvokeBrowser(FaceDox.java:17)
    at facedoxmain.FaceDox.main(FaceDox.java:57)
Caused by: org.openqa.selenium.net.UrlChecker$TimeoutException: Timed out waiting for [http://localhost:20033/hub/status] to be available after 45005 ms
    at org.openqa.selenium.net.UrlChecker.waitUntilAvailable(UrlChecker.java:100)
    at org.openqa.selenium.firefox.XpiDriverService.waitUntilAvailable(XpiDriverService.java:129)