sudo dpkg -i mysql-community-client-plugins_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i mysql-community-client-core_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i mysql-common_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i mysql-community-client_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i libmysqlclient21_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i libmysqlclient-dev_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i libaio1_0.3.112-5_amd64.deb 
sudo dpkg -i libmecab2_0.996-10build1_amd64.deb 
sudo dpkg -i mysql-client_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i mysql-community-server-core_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i mysql-community-server_8.0.25-1ubuntu20.04_amd64.deb 
sudo dpkg -i mysql-server_8.0.25-1ubuntu20.04_amd64.deb 

启动mysql
sudo service mysql restart
连接mysql
mysql -uroot -p