1、更新apt-get源

# sudo apt-get install Python-software-properties
# sudo apt-add-repository ppa:brightBox/ruby-ng
# sudo apt-get update

2、安装ruby-dev

sudo apt-get install ruby2.3-dev

3、安装ruby

sudo apt-get install ruby2.3

4、安装rails

sudo gem install rails

5、/usr/local/bin/rails -v

Rails 5.0.1