按照此教程在MacBook上安装ROS时遇到一些问题，记录网上查找的解决方法：
问题1. 安装homebrew出错： Failed to connect to raw.githubusercontent.com port 443: Connection refused error:
解决方法：
此博客中方法二
问题2. 安装homebrew出错 ：
fatal: unable to access 'https://github.com/Homebrew/homebrew-core/': transfer closed with outstanding read data remaining
Error: Failure while executing; `git clone https://github.com/Homebrew/homebrew-core /usr/local/Homebrew/Library/Taps/homebrew/homebrew-core` exited with 128.
Error: Failure while executing; `/usr/local/bin/brew tap homebrew/core` exited with 1.
Failed during: /usr/local/bin/brew update --force
解决方法：参考此博客
注：安装教程中【6. 安装DDS（Data Distribution Service）】未安装