安装mysql2报错：Failed to build gem native extension. ruby extconf.
解决办法：sudo apt-get install libmysqld-dev
安装rmagick报错：rmagick gem install “Can't find Magick-config”
解决办法：sudo apt-get install libmagickwand-dev
安装mysql2报错：Failed to build gem native extension. ruby extconf.
解决办法：sudo apt-get install libmysqld-dev
安装rmagick报错：rmagick gem install “Can't find Magick-config”
解决办法：sudo apt-get install libmagickwand-dev
![sudo apt-get update 出错 Updating from such a repository can‘t be done securely, and is therefore[图]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)