ubuntu 下 使用rvm use 以及报rails已安装报没安装处理

curl -L get.rvm.io | bash -s stable

RVM is not a function, selecting rubies with 'rvm use ...' will not work.
You need to change your terminal emulator preferences to allow login shell.
Sometimes it is required to use `/bin/bash --login` as the command.
Please visit https://rvm.io/integration/gnome-terminal/ for a example.

程序“rails”尚未安装。  您可以使用以下命令安装：
sudo apt-get install rails

source .bash_profile