为什么全新安装的node.js和protractor错误地输出`execvp`没有这样的文件或目录？

我已经安装了几个版本的node.js和protractor,然后按照说明更新了webdriver,但是我没有想到的任何组合都能成功启动webdriver.

一些有用的细节：

>在Ubuntu 64位上
>尝试了node.js v0.10.15和v0.10.26
>尝试量角器0.18.1和0.19.0

这是我运行的命令,以及相应的错误(安装量角器后)：

$webdriver-manager update
Updating selenium standalone
downloading https://selenium.googlecode.com/files/selenium-server-standalone-2.39.0.jar...
Updating chromedriver
downloading https://chromedriver.storage.googleapis.com/2.8/chromedriver_linux64.zip...
chromedriver_2.8.zip downloaded to /home/<user>/.nvm/v0.10.26/lib/node_modules/protractor/selenium/chromedriver_2.8.zip
selenium-server-standalone-2.39.0.jar downloaded to /home/<user>/.nvm/v0.10.26/lib/node_modules/protractor/selenium/selenium-server-standalone-2.39.0.jar


$webdriver-manager start
execvp(): No such file or directory
seleniumProcess.pid: 4567

events.js:72
        throw er; // Unhandled 'error' event
              ^
Error: spawn ENOENT
    at errnoException (child_process.js:988:11)
    at Process.ChildProcess._handle.onexit (child_process.js:779:34)

结果我需要安装Java Development Kit(JDK),然后它工作正常.