ERROR: Error installing mysql2: ERROR: Failed to build gem native extension [@Ubuntu 15.04]

参考文章：
https://blog.csdn.net/a60919820/article/details/101847890

安装mysql

参考：https://www.cnblogs.com/haima/p/15504670.html

再安装libmysqlclient-dev 和 mysql2

sudo cp /etc/apt/sources.list /etc/apt/sources.listbak #备份源
sudo vim /etc/apt/sources.list  # 添加下面的源
deb [by-hash=force] https://mirrors.huaweicloud.com/deepin/ apricot main contrib non-free
sudo apt-get update  #更新源
sudo apt-get upgrade 不用执行

安装mysql
参考下面的链接下载 mysql-apt-config_0.8.20-1_all.deb

https://www.ywnz.com/linuxysjk/9249.html

选择安装mysql87或者mysql5.7的源
sudo dpkg -i ./mysql-apt-config_0.8.20-1_all.deb

sudo apt-get update  #更新源
sudo apt-get install mysql-server  #安装mysql

sudo service mysql status  #查看MySQL是否安装成功

sudo apt-get install libmysqlclient-dev  #安装mysql客户端依赖

cd 进入项目的根目录里
gem install mysql2 -v '0.4.10' --source 'https://gems.ruby-china.com/'
bundle install #安装项目的依赖
rails s #启动项目