默认情况下，Ubuntu20.04安装MySQL的版本为8.0。但8.0更加严格的加密规则，使得一些配置难以实现，下面就来为大家介绍在ubuntu20.04中怎么安装MySQL5.7.x。
一、下载安装包（这里以5.7.32为例）
官方下载地址：https://downloads.mysql.com/archives/community/
二、解压安装包
到下载安装包的路径解压安装包
tar -xzf mysql-server_5.7.32-1ubuntu18.04_amd64.deb-bundle.tar
三、安装MySQL5.7.32
1.更新依赖源及安装libaio1、libtinfo5依赖
sudo apt-get update
sudo apt-get upgrade
sudo apt-get install libaio1
sudo apt-get install libtinfo5
2.按下列顺序安装（提示缺少依赖可更换顺序）
sudo dpkg -i mysql-common_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg-preconfigure mysql-community-server_5.7.32-1ubuntu18.04_amd64.deb #此步需要输入数据的root密码
sudo dpkg -i libmysqlclient20_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i libmysqlclient-dev_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i libmysqld-dev_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-community-client_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-client_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-common_5.7.32-1ubuntu18.04_amd64.deb
3.继续安装依赖
sudo apt-get -f install
sudo apt-get -f install libmecab2
4.安装mysql－server
sudo dpkg -i mysql-community-server_5.7.32-1ubuntu18.04_amd64.deb
sudo dpkg -i mysql-server_5.7.32-1ubuntu18.04_amd64.deb
5.检测安装
mysql -u root -p
三、配置MySQL
1.初始化配置
sudo mysql_secure_installation
2.配置说明
#1
VALIDATE PASSWORD PLUGIN can be used to test passwords...
Press y|Y for Yes, any other key for No: N (选择N，不会进行密码的强校验)
#2
Please set the password for root here...
New password: (输入密码)
Re-enter new password: (重复输入)
#3
By default, a MySQL installation has an anonymous user allowing anyone to log into MySQL without having to have a user account created for them...
Remove anonymous users? (Press y|Y for Yes, any other key for No) : N (选择N，不删除匿名用户)
#4
Normally, root should only be allowed to connect from，'localhost'. This ensures that someone cannot guess at the root password from the network...
Disallow root login remotely? (Press y|Y for Yes, any other key for No) : Y (我的选项，选择N，允许root远程连接)
#5
By default, MySQL comes with a database named 'test' that anyone can access...
Remove test database and access to it? (Press y|Y for Yes, any other key for No) : N (选择N，不删除test数据库)
#6
Reloading the privilege tables will ensure that all changes made so far will take effect immediately.
Reload privilege tables now? (Press y|Y for Yes, any other key for No) : Y (选择Y，修改权限立即生效)
3.检查mysql服务状态
service mysql status