我是 ruby和rails的新手,我把rails安装到ubuntu.但是当我通过键入“rails s”进入启动服务器时,它不会启动并发送以下消息.
但是我可以通过命令rails new new_project创建一个新的项目.请铁路专家帮助我.

root@ubuntu:~# rails s Usage: rails new APP_PATH [options] Options: -j,[--javascript=JAVASCRIPT] 
# Preconfigure for selected JavaScript library # Default: jquery -m,[--template=TEMPLATE] # Path to an application template (can be a filesystem path or URL) [--dev] 
# Setup the application with Gemfile pointing to your Rails checkout -J,[--skip-javascript] # Skip JavaScript files [--edge] 
# Setup the application with Gemfile pointing to Rails repository -G,[--skip-git] 
# Skip Git ignores and keeps -d,[--database=DATABASE] 
# Preconfigure for selected database (options: MysqL/oracle/postgresql/sqlite3/frontbase/ibm_db/sqlserver/jdbcMysqL/jdbcsqlite3/jdbcpostgresql/jdbc) 
# Default: sqlite3 -b,[--builder=BUILDER] 
# Path to a application builder (can be a filesystem path or URL) -r,[--ruby=PATH] 
# Path to the Ruby binary of your choice 
# Default: /usr/bin/ruby1.8 [--old-style-hash] 
# Force using old style hash (:foo => 'bar') on Ruby >= 1.9 [--skip-gemfile] 
# Don't create a Gemfile -O,[--skip-active-record] 
# Skip Active Record files [--skip-bundle] # Don't run bundle install -T,[--skip-test-unit] 
# Skip Test::Unit files -S,[--skip-sprockets] 
# Skip Sprockets files Runtime options: -q,[--quiet] 
# Supress status output -f,[--force] 
# Overwrite files that already exist -s,[--skip] 
# Skip files that already exist -p,[--pretend] 
# Run but do not make any changes Rails options: -h,[--help] 
# Show this help message and quit -v,[--version] 
# Show Rails version number and quit Description: The 'rails new' command creates a new Rails application with a default directory structure and configuration at the path you specify. You can specify extra command-line arguments to be used every time 'rails new' runs in the .railsrc configuration file in your home directory. Note that the arguments specified in the .railsrc file don't affect the defaults values shown above in this help message. Example: rails new ~/Code/Ruby/weblog This generates a skeletal Rails installation in ~/Code/Ruby/weblog. See the README in the newly created application to get going

rails new my_app

cd my_app

rails s