Ubuntu下升级Mysql全过程（亲测）_ubuntu mysql从5.7更新到5.0

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0、测试环境状态

环境：
Ubuntu 18.04.1 LTS
mysql 5.7（初次安装，没有数据）

目标：将mysql升级到8.0；不考虑数据问题；

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1、下载mysql的apt的源

https://dev.mysql.com/downloads/

将下载的mysql-apt-config_0.8.15-1_all.deb文件复制到服务器；

2、升级

dpkg -i mysql-apt-config_0.8.15-1_all.deb 
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Configuration file '/etc/mysql/mysql.conf.d/mysqld.cnf'
 ==> Modified (by you or by a script) since installation.
 ==> Package distributor has shipped an updated version.
   What would you like to do about it ?  Your options are:
    Y or I  : install the package maintainer's version
    N or O  : keep your currently-installed version
      D     : show the differences between the versions
      Z     : start a shell to examine the situation
 The default action is to keep your current version.
*** mysqld.cnf (Y/I/N/O/D/Z) [default=N] ? Y

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apt update
apt install mysql-server
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查看版本

mysql -V
mysql  Ver 8.0.25 for Linux on x86_64 (MySQL Community Server - GPL)
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Mysql已成功升级！

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