Ruby on rails linux webrick rails服务器无法启动--出现一些错误

我已经在linux（ubuntu 14.04）上成功安装了Ruby、rails和mysql2。 现在的问题是当我运行

rails服务器时

/home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/execjs-2.5.2/lib/execjs/runtimes.rb:48:in `autodetect': Could not find a JavaScript runtime. See https://github.com/rails/execjs for a list of available runtimes. (ExecJS::RuntimeUnavailable)
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/execjs-2.5.2/lib/execjs.rb:5:in `<module:ExecJS>'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/execjs-2.5.2/lib/execjs.rb:4:in `<top (required)>'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/uglifier-2.7.1/lib/uglifier.rb:3:in `require'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/uglifier-2.7.1/lib/uglifier.rb:3:in `<top (required)>'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.4/lib/bundler/runtime.rb:76:in `require'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.4/lib/bundler/runtime.rb:76:in `block (2 levels) in require'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.4/lib/bundler/runtime.rb:72:in `each'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.4/lib/bundler/runtime.rb:72:in `block in require'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.4/lib/bundler/runtime.rb:61:in `each'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.4/lib/bundler/runtime.rb:61:in `require'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/bundler-1.9.4/lib/bundler.rb:134:in `require'
    from /home/sharif/Sites/simple_cms/config/application.rb:7:in `<top (required)>'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:78:in `require'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:78:in `block in server'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:75:in `tap'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:75:in `server'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/railties-4.2.1/lib/rails/commands.rb:17:in `<top (required)>'
    from /home/sharif/Sites/simple_cms/bin/rails:8:in `require'
    from /home/sharif/Sites/simple_cms/bin/rails:8:in `<top (required)>'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/client/rails.rb:28:in `load'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/client/rails.rb:28:in `call'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/client/command.rb:7:in `call'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/client.rb:26:in `run'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/bin/spring:48:in `<top (required)>'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/binstub.rb:11:in `load'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/spring-1.3.4/lib/spring/binstub.rb:11:in `<top (required)>'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /home/sharif/.rbenv/versions/2.2.2/lib/ruby/site_ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in `require'
    from /home/sharif/Sites/simple_cms/bin/spring:13:in `<top (required)>'
    from bin/rails:3:in `load'
    from bin/rails:3:in `<main>'

我不是一个命令行专家，只是想学习RubyonRails。。。请帮忙

---

有什么想法吗？

安装

nodejs

sudo apt-get install nodejs

---

可能是@jonsnow的重复，长官我已经更新了我的问题。。。请帮助作为错误建议尝试安装

sudo-apt-get-install-libreadline-dev

@jonsow我遇到了同样的问题…你重新安装了ruby吗？在您的ruby版本中尝试以下命令

rvm删除1.9.2

和

rvm安装1.9.2

谢谢你的回答。我刚刚遇到了同样的问题，你的回答对我很有用+1 :)

sudo apt-get install nodejs